Assuming independence,
prob=P(late,early)+P(early,late)=(1/10)(2/5)+(2/5)(1/10)
First, you need to find the total amount they discounted.
3.66 X 3= $10.97
Since they took off that much, you need to add that to the total cost, which was 62. 31
62.31 + 10.97= $73.29
Finally, to find how much each individual shirt cost, you divided it by 3.
73.29 / 3= $24. 43
The answer is C