The correct option is A ₹ 200
Simple Interest at the end of 't' years is given by Principal× Rate× Time100.
Given, Principal = ₹ 800 and rate = 10% and time = 2 years and 6 months = 2.5 years.
Hence, the simple Interest at the end of 2.5 years = 800× 10× 2.5100 = ₹ 200.