Calculate the initial answer a, b,c, d and e .

In order to calculate this, we can use this solution:
If it is a loss:

Cost Price = Selling Price  × (100 ÷ (100 - Perc. Loss))

If it is an increase:

Cost Price = Selling Price × (100 ÷ (100 + Perc. Increase))

a) £54.60 × (100 ÷ (100 - 9))
£54.60 × (100 ÷ 91) = £60

b) £34.40

c) £28.50

d) £64

e) £12.50

Ithink it is 7. 16