Question

Every week, Fred deposits $84 into his savings account, which is 20% of his weekly income. How much income does Fred make each week?

a) $336
b) $100
c) $420
d) $500

Answer 1

Fred's weekly income is calculated by dividing the amount he deposits ($84) by the percentage of his income it represents (20%). The calculation determines that Fred's weekly income is $420.

Step-by-step explanation:

To solve how much Fred makes each week, we should recognize that the $84 he deposits is 20% of his weekly income. We can represent his total weekly income by the variable I. If 20% of I equals $84, we can create the equation 0.20I = $84.

To find I, we divide both sides of the equation by 0.20:

0.20I / 0.20 = $84 / 0.20
I = $420

Therefore, Fred's weekly income is $420. The correct answer is c) $420.