Answer fast i will mark you brainlist and full ! a) isaac is purchasing two pairs of shoes—one pair for $37.00 and the second pair for $42.00. the state sales tax applied to isaac’s bill is 7%. how much is isaac’s total bill? show your work. (2 points) b) if isaac uses a coupon entitling him to a 25% discount off the purchase price before tax, how much will his bill be? assume that a 7% sales tax is applied to the discounted price. using words, explain how you found the discounted price. (3 points)