Answer:
$3.36
Explanation:
You want to know the new price when a price of $2.80 is increased by 20%.
Increase
The increase in the price is ...
20% × $2.80 = (20/100) × $2.80 = 2/10 × $2.80 = 2 × ($2.80/10)
= 2 × $0.28 = $0.56 . . . . . . the amount of the price increase
New price
Then the increased price is ...
$2.80 + 0.56 = $3.36
The new price of the candy bar is $3.36.
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Additional comment
As we see above, finding 10% or 20% of a number is often easily accomplished using mental arithmetic.
The multiplier of the price is (1 +20%) = (1 +0.20) = 1.20.
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