The cost of packaging of mangoes is 40% cost of fresh mangoes mselves. The cost of mangoes increased by 30% but cost of packaging decreased by 50%, n percentage change of cost of packed mangoes, if cost of packed mangoes is equal to sum of cost of fresh mangoes and cost of packaging :

Cost of fresh mangoes + Cost of packaging = Total cost
Let initial Cost of fresh, mangoes = 100
Then, packaging cost = 40
Thus, Initial total cost = 100 + 40 = 140
After increasing in cost of fresh mangoes 30%,
Cost of fresh mangoes = 130
And cost of packing go down by 50 % so,
Cost of packing = 20
Now Total cost = 130 + 20 = 150
Increased cost = 150 - 140 = 10
% increased = $$ = \frac{{10 \times 100}}{{140}} = 7.14\% $$