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Method 1:

80 * .4 + 80 = 32 + 80 = 112

Method 2:

1. Add 100% to 40% = 140%

2. Convert 140% to decimal form: 140%/100 = 1.4

3. Multiple 1.4 * 80 = 112 <--- this is your answer.

Note: The reason you add 100% to the 40% is because the phrase "increase 80" means you have to add 100% of 80 (which is 80 * (100%/100) = 80 * 1 = 80) to the increasing percentage (80 * 40% = 80 * (40%/100) = 80 * .4 = 32) to get your final answer (80 + 32 = 112).

It looks like this in summary form:

80 * 100% = 80 * (100%/100) = 80 * 1 = 80

80 * 40% = 80 * ( 40%/100) = 80 * .4 = 32

80 + 32 = 112

You should be able to easily see that you can add 100% + 40% to get 140%, which converts to the decimal number 1.4

1.4 * 80 = your answer (i.e. 112).

==============

Previous explanation:

Right so you take 80, divide it by 10 (100 if you wanna stay with the full shabang) then multiply it by 4 (40 if you have already divided by 100) and the answer will be 32. add this number to 80.

The answer is 112

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Wiki User

12y ago
This answer is:
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why so cofusing
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80 x .40 = 32

Add 32 to 80

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80/100

x40

x+80

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Q: How do you increase 80 by 40 percent?
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