One week a computer store sold a total of 36 computers and external hard drives. The revenue from these sales was $28765. Ifcomputers sold for $1180 per unit and hard drives for $125 per unit, how many of each did the store sell? Solution let no. of computers sold= x no. of hard drives sold = y applying given condition, 1180x + 125y = 28765 ......1 x+y = 36........2 solving eq 1 and 2 we get x= 23 y = 13.