Recent content by failure by design.

tax is $2.40 ...? The amount of sales tax varies directly with the cost of the purchase. If the sales tax is $2.40 on a purchase of $40.00, what would be the sales tax on a purchase of $60.50? A) $3.03 B) $3.63 C) $4.80 D) $4.24 and The cost of sending a letter is directly proportional to...