Given,
Discount = 25%
Discount = (MP × Discount %)/100
= (MP×25)/100
= Rs 25MP/100
SP = MP – Discount
= (MP – 25MP/100)
= (100MP – 25MP)/100
= 75MP/100
We know that the given profit = 50%
Selling price = (100 + Gain %)/100 × CP
= (100 + 50)/100 × CP
= 150/100 × CP
= 150CP/100
By equating both SP we get,
75MP/100 = 150CP/100
75MP/150CP = 100/100
75MP/150CP = 1
(By cross multiplying)
CP/MP = 75/150
= 1/2
∴ The ratio CP to MP = 1:2