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anzhelika [568]
3 years ago
9

Use mental math to approximate what a 15% tip would be for a bill of $31.99.

Mathematics
2 answers:
rodikova [14]3 years ago
5 0

The whole bill is $31.99 that is 100%. You can use mental math to determine exatcly 15% from $31.99:

1. 15%=10%+5%

2. To find 10% from $31.99 you should simply divide $31.99 by ten. Thus, 10% from $31.99 is $3.199.

3. 5% is half of 10%, then 5% from $31.99 is $3.199:2=$1.5995.

4. 15% from $31.99 is $3.199+$1.5995=$4.7985≈$4.80.

Answer: correct choice is B.

Mrrafil [7]3 years ago
4 0
Letter B bc if you do the actual math it comes to be 4.79 so mentally you would give a 4.80 tip
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