Solution
For this case the inital amount was $75.00
We can find the individual costs like this:
C1= 4$ * 3= 12.00
C2= 4$* 4= 16.00
C3 = 21.00$
Then total cost= 12+16+21= 49$
Then the amount of money left is:
75.00 -49.00 $= 26.00$
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