Answer:
Coupon A is better by $2.80.
Explanation:
You want to know how much better the best price is between coupon A's $55 rebate on $87 worth of pants, or coupon B's 60% off.
Reduction
The price reduction offered by coupon B is ...
0.60 × $87 = $52.20
Comparison
Clearly, the $55 reduction offered by coupon A is a greater reduction than the $52.20 reduction offered by coupon B. The difference in value is ...
$55.00 -52.20 = $2.80
Coupon A gives the lower price by $2.80.