Answer:

20%

Step-by-step explanation:

CP of 2 toffees= Rs.1

" " 1 toffee= Rs.1/2

" " 5 toffees= 1/2 ×5 =Rs.5/2= Rs.2.5

SP of 5 toffees=Rs.3

Total profit = Rs.3-Rs.2.5=Rs. 0.5

Profit %= (Profit/CP)×100

(0.5/2.5)×100

(1/5)×100

=20%