Question
After getting two successive discount, a shirt with a list price of Rs. 150 is available at Rs. 105. If the second discount is 12.5% , find the first discount .
Answer: Option A
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Let the first discount be `x`%
Then , 97.5% of (100 - `x`)% of 150 = 105
`rArr 87.5/100 xx (100 - x)/100 xx 150 = 105 rArr 100 - x = ((105 xx 100 xx 100)/(150 xx 87.5))` = 80
`rArr x = (100 - 80) = 20.`
`:.` First discount = 20%
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