Starting with 120 pennies he has $1.20
If he has three times as many pennies as he does nickels, he has 120 pennies / 3 nickels per penny = 40 nickels. 40 nickels = 40 * $0.05 = $<<40*0.05=2>>2
If he has five times as many nickels as dimes he has 40 nickels / 5 dimes per nickel = 8 dimes. 8 * $0.10 = $<<40/5*0.10=0.80>>0.80
if he has twice as many quarters than he does dimes, he has 8 dimes * 2 quarters per dime = 16 quarters = 16 *$ 0.25 = $<<8*2*0.25=4.00>>4.00
In all he has $1.20 + $2.00 + $0.80 + $4.00 = $<<1.20+2+0.8+4=8.00>>8.00
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