# Need a Mathmatician..Watch

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#1
Customers at a shop who spend £100 or more can pay by these methods.
A 12 payments Each payment is 10% of the cost price
B 24 payments Each payment is 6% of the cost price
C 36 payments Each payment is 4% of the cost price
Which method is the cheapest?
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4 years ago
#2
find the percentages for example 4% of 100 I would guess.

Don't quote me as I am not a mathematician and don't think I am certain.
0
4 years ago
#3
(Original post by snylekm)
Customers at a shop who spend £100 or more can pay by these methods.
A 12 payments Each payment is 10% of the cost price
B 24 payments Each payment is 6% of the cost price
C 36 payments Each payment is 4% of the cost price
Which method is the cheapest?
Depends how much they actually spend

Posted from TSR Mobile
0
4 years ago
#4
(Original post by midgemeister7)
Depends how much they actually spend

Posted from TSR Mobile
No it doesn't. The same payment method will be the least expensive regardless of how much is spent since all payments are a percentage of the amount spent.
0
4 years ago
#5
(Original post by snylekm)
Customers at a shop who spend £100 or more can pay by these methods.
A 12 payments Each payment is 10% of the cost price
B 24 payments Each payment is 6% of the cost price
C 36 payments Each payment is 4% of the cost price
Which method is the cheapest?
For method A, you end up spending 12x10=120% of the cost price.
For method B, you end up spending 24x6=144% of the cost price.
For method C, you end up spending 36x4=144% of the cost price.

Hence, method A is the cheapest.
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#6
(Original post by JRichardson12)
For method A, you end up spending 12x10=120% of the cost price.
For method B, you end up spending 24x6=144% of the cost price.
For method C, you end up spending 36x4=144% of the cost price.

Hence, method A is the cheapest.
Yeh this is the answer in the aqa mark scheme but i dont know how you went about to find that answer... can you please give an explanation on the method...the question really had me baffled. Much appreciated
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4 years ago
#7
(Original post by snylekm)
Yeh this is the answer in the aqa mark scheme but i dont know how you went about to find that answer... can you please give an explanation on the method...the question really had me baffled. Much appreciated
I'll give you an example:
Let us stipulate you had an amount of £100.00, ok?

A) In the first scenario, paying in increments of 12 with 10% of the cost price (£10.00) you will be paying £120.00.

B) In the second scenario, using the same amount, you will pay 6% (£6.00) 24 times so you will end up paying a total of £144.00.

C) In the final scenario, you will also be paying £144.00 following the same process.

From the example alone we are able to see that A is the most reasonable options and as we used a stipulated amount of £100.00 we can easily express it in percentages as the user before has shown.
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#8
(Original post by Akashi)
I'll give you an example:
Let us stipulate you had an amount of £100.00, ok?

A) In the first scenario, paying in increments of 12 with 10% of the cost price (£10.00) you will be paying £120.00.

B) In the second scenario, using the same amount, you will pay 6% (£6.00) 24 times so you will end up paying a total of £144.00.

C) In the final scenario, you will also be paying £144.00 following the same process.

From the example alone we are able to see that A is the most reasonable options and as we used a stipulated amount of £100.00 we can easily express it in percentages as the user before has shown.
hmm i see what has been done but im scared if a question like this came up in the mocks and i wont know what to do.
0
4 years ago
#9
(Original post by snylekm)
Yeh this is the answer in the aqa mark scheme but i dont know how you went about to find that answer... can you please give an explanation on the method...the question really had me baffled. Much appreciated
You do the same thing for each method and compare the total payments to determine the cheapest method:

Find the payment (for A this is 10% of amount spent) = 0.10 x 100 = 10
Total payment = number of payments x payment amount = 12 x 10 = 120 (for A)
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