James purchased 2 t-shirts and a pair of jeans online and paid $80 for his purchase. the next week, the same site was offering a 50% discount on all its clothes. james bought 3 t-shirts and two pairs of jeans for $70. what were the original prices of t-shirts and jeans? (assume that all t-shirts had the same original price, as did all pairs of jeans.)
a. t-shirt, $25; jeans, $30
b. t-shirt, $20; jeans, $30
c. t-shirt, $20; jeans, $40
d. t-shirt, $25; jeans, $35
is it a. b. c. or d.