124 is 80 percent of 155.
Proportion
124/x = 80/100
Cross multiply: 80x = 12400
Simplify: x = 155
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To find 12 percent of a number, multiply the number by 0.12. In this instance, 0.12 x 124 = 14.88. Therefore, 12 percent of 124 is equal to 14.88.
Multiply the number by .8 to get 80% of that number.
To find 40 percent of a number, multiply by 0.4. In this instance, 310 x 0.4 = 124. Therefore, 40 percent of 310 is 124.
45 percent of 80 = 36
take the number and multiply it by .8 like .8x100 (80 percent of 100) = 80