Successive discounts of 20% and 15% are equal to a single discount of ?

The marked price of a radio is 20% more than its cost price. If a discount of 10% is given on the marked price, the gain per cent is:

• [A] 15
• [B] 12
• [C] 10
• [D] 8

A merchant has announced 25% rebate on prices of ready-made garments at the time of sale. If a purchaser needs to have a rebate of Rs. 400, then how many shirts, each costing Rs. 320, should he purchase?

• [A] 10
• [B] 7
• [C] 6
• [D] 5

A man invests equal sums in 6% stock and 8% stock, and gets 10% for his money. The 8% stock is at Rs. 80. What is the price at which he purchased the 6% stock?

• [A] Rs. 60
• [B] Rs. 80
• [C] Rs. 100
• [D] Rs. 120

Some articles were bought at 6 articles for Rs. 5 and sold at 5 articles for Rs. 6. Gain percent is:

• [A] 30%
• [B] 33 ¹/₃
• [C] 35%
• [D] 44%

If each worker is paid Rs. 15 instead of Rs. 10 per day, what is the Merchant’s profit (in Rs.)?

• [A] 10800
• [B] 18000
• [C] 40000
• [D] 27200