∵ CP of 80 apples = ₹ 240
∴ CP of 1 apples = ₹ 3
∴ CP of 20 apples = ₹ 60
To earn a profit of 20%
SP = 120% of 240 = ₹ 288
But he sales 1/4 of his apples i.e., 20 apples for ₹ 60
∴ SP of remaining 60 apples = 288 - 60 = ₹ 228
∴ SP of 1 apple = 228/60 = ₹ 3.80