Answer:
Final Amount = ₹26.40
Increased by = ₹9.90
Explanation:
Given: ₹16.50 increases in the ratio 5:3
formula of a quantity increasing in a ratio: (quantity) X b/a [ where b/a is the reciprocal of the ratio]
so,

which is: 9.9
so ₹16.50 increases by ₹9.90
so final amount is ₹16.50 + ₹9.90 = ₹26.40