What is an expression for the sale price of a shirt that is sold at 40% off the original price p?

A. t=80-m
B. t=m-80
C. t=80+m
D. t=80m

None of them

To find the sale price of the shirt, we need to subtract the discount amount from the original price.

The discount amount can be calculated as 40% of the original price. To calculate this, multiply the original price (p) by 40% (or 0.4).

So the discount amount is given by 0.4p.

To find the sale price (t), we subtract the discount amount from the original price:

t = p - 0.4p

This can be simplified to:

t = (1 - 0.4)p

Which further simplifies to:

t = 0.6p

Therefore, the correct expression for the sale price of the shirt is represented by option C: t = 80 + m.