Answer:
£21.21
Explanation:
First, find the total price of the two items before the discount was applied. To do this, multiply the discounted price by 1.15, which is the decimal form of 115%. I added 15% to 100% in order to reverse to discount.
29.75 * 1.15 = 34.21
Now that we know the total price before the discount, we can subtract the value of the tie from the total price to find the price of the shirt:
34.21 - 13 = 21.21
The shirt cost £21.21 before the discount.
Hope this helps :)