Huang has a coupon that gives him 20% off all items purchased. He buys 3 shirts that each cost the same amount, and he pays with a $100 bill. Which expression

Huang has a coupon that gives him 20% off all items purchased. He buys 3 shirts that each cost the same amount, and he pays with a $100 bill. Which expression represents the amount of change Huang should receive? Check all that apply.

100 – (0.2(3x))

100 – (0.8(3x))

100 – (1 – 0.2)(3x)

(100 – 1 – 0.2)(x + x + x)

100 – (0.8x + 0.8x + 0.8x)