Respuesta :
64% on sale means ( 100-64 = 36) 36% are full price
125 * 0.36 = 45 CDs are full price
125 cd .................. 100%
x cd .....................36%
x = 36*125:100 = 4500:100 = 45 cds at full price
x cd .....................36%
x = 36*125:100 = 4500:100 = 45 cds at full price