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# Don't get the wording of this question - MATHS :( watch

1. Xiang recieves her gas bill. She used 1937 units of gas. She pays £0.0842 for the first 512 units and £0.0786 for the remainder. Tax is added at 5% of the total.

What is Xiang's total gas bill to the nearest penny?

Any ideas?

I get 163p some people are saying it is 17p
2. (Original post by Reversed Flash)
Xiang recieves her gas bill. She used 1937 units of gas. She pays £0.0842 for the first 512 units and £0.0786 for the remainder. Tax is added at 5% of the total.

What is Xiang's total gas bill to the nearest penny?

Any ideas?

I get 163p some people are saying it is 17p
Can you post your working out? The price given is the price per unit ... I've never seen a gas bill that small so try again
3. (Original post by Muttley79)
Can you post your working out? The price given is the price per unit ... I've never seen a gas bill that small so try again
I know

Here they are

(0.0842 X 512) + (0.0786 X 1425) = 155.1154

1.05 X 155.1154 = 163p (to the nearest penny)

I am probs wrong :/
4. (Original post by Reversed Flash)
I know

Here they are

(0.0842 X 512) + (0.0786 X 1425) = 155.1154

1.05 X 155.1154 = 163p (to the nearest penny)

I am probs wrong :/
Weren't the unit costs in £s not pence?
5. (Original post by Muttley79)
Weren't the unit costs in £s not pence?
Yes?
6. (Original post by Muttley79)
Weren't the unit costs in £s not pence?
It the wording off the question that just breaks my mind. £0.0842 for the first 512 units. So £0.0842 = 512 units?
7. (Original post by Reversed Flash)
It the wording off the question that just breaks my mind. £0.0842 for the first 512 units. So £0.0842 = 512 units?
No - the cost per unit for 512 is £0.0842 so your working was correct except for the units
8. (Original post by Muttley79)
No - the cost per unit for 512 is £0.0842 so your working was correct except for the units
So I do 1937-512 to find the remaining units... which is going to be £0.0786.

But I dont get it so is this working correct

1.05 X ( 0.0842 + 0.0786 )
9. (Original post by Reversed Flash)
Xiang recieves her gas bill. She used 1937 units of gas. She pays £0.0842 for the first 512 units and £0.0786 for the remainder. Tax is added at 5% of the total.

What is Xiang's total gas bill to the nearest penny?

Any ideas?

I get 163p some people are saying it is 17p
I got 163, although you may want to check your units. If each unit is 7 or 8p and nearly 2,000 units have been used, it's going to be a lot more than 163p. Do a "back-of-the-envelope" ballpark calculation first so you know roughly how big an answer you're expecting.
10. you do 512*0.0842 = £43.1104
then do 1937-512 (for the remainder). then you do 1425*0.0786 = £112.005.
then do £43.1104+£112.005 = £155.1154.
then to get the cost including tax you do £155.1154*1.05 = £162.87.
The answer is not in pence as the values given in the question are in pounds.
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11. (Original post by Puppo)
you do 512*0.0842 = £43.1104
then do 1937-512 (for the remainder). then you do 1425*0.0786 = £112.005.
then do £43.1104+£112.005 = £155.1154.
then to get the cost including tax you do £155.1154*1.05 = £162.87.
The answer is not in pence as the values given in the question are in pounds.
First step:
(£0.0842*512)
This gives you the cost for the first 512 units

Second step:
(£0.0786+(1937-512))
This gives you the cost of the remaining units

Third step:
Add these 2 values together to get the total

Step 4:
Calculate 5% of the total by multiplying by 5/100

Step 5:
Add the 5% to the total
(answer to step 4 + answer to step 3)
12. (Original post by Reversed Flash)
First step:
(£0.0842*512)
This gives you the cost for the first 512 units

Second step:
(£0.0786+(1937-512))
This gives you the cost of the remaining units

Third step:
Add these 2 values together to get the total

Step 4:
Calculate 5% of the total by multiplying by 5/100

Step 5:
Add the 5% to the total
(answer to step 4 + answer to step 3)
yea that works I just condensed step 4 and 5 into one. Also be careful as in step 2 you need to do £0.0786*(1937-512) not +
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