Answer: Yes he does.
Step-by-step explanation:
The shirt costs £9.60 and is on discount by 1/3.
1/3 = 0.3333
The discounted price is therefore:
= 9.60 * (1 - 0.3333)
= £6.43
The price of two shirts is:
= 6.43 + 6.43
= £12.86
Billy has £13 which is above the price of two so he will be able to buy 2 shirts.