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# Maths Help :( (percentages) 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?

__________

Got the answer right but in a time consumable way. Any other solutions people can give (quickest)?

Thanks!
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?

__________

Got the answer right but in a time consumable way. Any other solutions people can give (quickest)?

Thanks!
Moved to the maths forum

3. (Original post by Sonechka)
Moved to the maths forum

Thanks I just worked this out methodically such as I multiplied all of the units with their bills and then worked 5% of that. Added the 5% on, I was wondering if anyone else had faster/quicker techniques.
4. (Original post by Reversed Flash)
Xiang recieves her gas bill.
I see they've put in a non-British name to try to prove they're definitely not racist.
5. (Original post by Reversed Flash)
Thanks I just worked this out methodically such as I multiplied all of the units with their bills and then worked 5% of that. Added the 5% on, I was wondering if anyone else had faster/quicker techniques.
Well if you want to add 5% of a number onto it, you can always just multiply it by 1.05 rather than calculating 5% of it and adding it on separately. Apart from that, there isn't really a faster method. Multiplying the number of units by the price per unit (I'm assuming the prices you gave are the prices per unit, else you wouldn't have to do any multiplication at that stage) shouldn't take too long.
6. (Original post by Sonechka)
Well if you want to add 5% of a number onto it, you can always just multiply it by 1.05 rather than calculating 5% of it and adding it on separately. Apart from that, there isn't really a faster method. Multiplying the number of units by the price per unit (I'm assuming the prices you gave are the prices per unit, else you wouldn't have to do any multiplication at that stage) shouldn't take too long.
Of course that what I needed. Thanks

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