Answer:
We know that:
Box of nails: $3.80
Box of screws: $5.25
Claw Hammer: $12.95
Electric Drill: $42.50
A) If you buy 3 boxes of nails, 2 boxes of screws, 2 hammers, and 1 electric drill, the equation for the total cost will be:
cost = 3*$3.80 + 2*$5.25 + 2*$12.95 + 1*$42.50
Another expression could be:
cost = 3*$3.80 + 2*($5.25 + $12.95) + 1*$42.50
Where we used the 2 as a common factor.
Solving that equation we get that the total cost will be:
cost = $94.85