All calendars are 40% off at a bookstore. Which pair of expressions can both be used to find the price, p, of a calendar after the 40% discount?
A . 0.4 & 0.6
B. 0.6 & p-0.4p
C. p-0.4p & p-0.6p
D. 0.4 & p-0.6p

6th grade math