If you have four rolls of quarters three rolls of dimes and six rolls of nickels how much do you have

We know that
the number of coins that each roll contains is
rolls of quarters> 40 coins
rolls of Dimes> 50 coins
rolls of nickels> 40 coins

four rolls of quarters> 4*40*$0.25> $40
three rolls of Dimes> 3*50*$0.10> $15
six rolls of nickels> 6*40*$0.05> $12

total=[40+15+12]> $67

the answer is
$67

Your maths is very weak try yourself this would improve your skills don't depend on others