Alvin is selling his marble set. He has 100 marbles. 20% are white, 30% are black, and the rest are different colors. He sells the white ones for a nickel each, the black ones for a dime each, and the colors for $0.20 each. How much does he earn?
Step-by-step reasoning process below:
14
He has 20 white marbles because 100 x.

2 = 20.

He has 30 black marbles because 100 x.

3 = 30.

He has 50 color marbles because 100 - 20 - 30 = 50.

He earns $1 from white marbles because 20 x.

05 = 1.

He earns $3 from the black marbles because 30 x.

1 = 3.

He earns $10 from the colors because 50 x.

2 = 10.

He earns $14 in total because 1 + 3 + 10 = 14.

.

The answer is 14