4.
0:00 Intro
1:01 Sum 1. Two articles are sold for the same price, losing 10% on one and gaining 20% on the other. Find the cost price of each article, if Rs. 40 is gained on the whole transaction.
09:51 Sum 2. Three articles are sold for Rs 1,890; Rs 2,400 and Rs 1,135 respectively. The first article is sold at 12.5% profit and the second at 20% profit. If on the whole a loss of 3 1/8% is made, find the cost price of the third article.
23:44 Sum 3. A shopkeeper bought locks at the rate of 8 locks for Rs 1700 and sold them at the rate of 12 locks for Rs 2850. Calculate:
i)his gain percent, and
Ii) the number of locks he should sell to earn a net profit of Rs 2250
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