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4 votes
Help with the one that says Salvador

Help with the one that says Salvador-example-1
User Jishi
by
8.3k points

1 Answer

6 votes

Answer:

$0.52

Explanation:

A 15% tip would be ...

0.15 × $9.85 = $1.48

$2 is more than that amount by ...

$2.00 -1.48 = $0.52

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Alternate answer

Salvador left a tip of $2.00/$9.85 × 100% ≈ 20.3%. That is about 5.3% of the bill more than 15% of the bill.

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Comment on the alternate answer

One needs to be very careful when talking about differences and changes in percentages. 20.3 is about 35.4% more than 15.0, using 15.0 as the reference value. This percentage change is computed as (20.3/15.0 -1)×100%.

However 20.3% of 9.85 is 5.3% (of 9.85) more than 15.0% (of 9.85). This difference is found by subtracting, not by computing the percentage change.

User Ulentini
by
9.1k points

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