Question

Lorenzo plans to purchase three identical shirts. The shirts are on sale for 20% off. Let c represent the cost of each shirt. Which expressions can Lorenzo use to calculate his total cost for the three shirts after the discount? Select each correct answer.
1.20(3c)
3(c−0.20c)
3c−0.20(3c)
0.80(3c)

Answer 1

Let
c----------->  represent the cost of each shirt without discount
t-----------> total cost for the three shirts after the discount
d----------> discount

we know that
d=3c*0.20
t=3c-d-------------> 3c-[3c*0.20]--------> 3c*[1-0.20]=3c*(0.80)

the answer is 3c*(0.80)