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The Difference Between a Discount of 30% and Two Successive Discounts of 20% and 10% is Rs.144. Find the List Price of the Article. - Mathematics

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प्रश्न

The difference between a discount of 30% and two successive discounts of 20% and 10% is Rs.144. Find the list price of the article.

योग
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उत्तर

Let the list price be Rs.100
In the first case, discount = 30%
S.P.  = M.P. - discount
= Rs.100 - 30% of Rs.100
= Rs.70
In the second case, successive discounts = 20% , 10%
S.P. = `(1 - "D"_1/100)(1 - "D"_2/100)"M.P."`

= `(1 - 20/100)(1 - 10/100)100`

= `(80)/(100) xx (90)/(100) xx 100`
= Rs.72
∴ Difference between the S.P.'s
= Rs.72 - Rs.70
= Rs.2
When difference is Rs.2, M.P. = Rs.100
When differences is Rs.144, M.P.
= `(100 xx 144)/(2)`
= Rs.7200
∴ The list price of the article is Rs.7200.

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अध्याय 2: Profit , Loss and Discount - Exercise 2.4

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फ्रैंक Mathematics [English] Class 9 ICSE
अध्याय 2 Profit , Loss and Discount
Exercise 2.4 | Q 32
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