Last year, Mattress Wholesalers Inc. had a Cost of Goods Sold (COGS) of $7.49 million and an inventory of $x million. This year, COGS is $78.65 million and inventory is $1.56 million. What was its weeks of supply last year?
a) 8.45 weeks
b) 6.32 weeks
c) 9.56 weeks
d) 10.50 weeks