Question
A merchant bought 300 goods at Rs. 50 each. He sold a
part at a 20% profit and the rest at a 10% loss. If his overall profit is 4%, how many goods did he sell at a 20% profit?Solution
ATQ, Cost price of 300 goods = 300 × 50 = Rs. 15000 Selling price of 300 goods = 1.04 × 15000 = Rs. 15600 Let number of goods sold at a 20% profit be ‘x’ Then, goods sold at 10% loss = (300 – x) So, 1.20 × 50 × x + 0.90 × 50 × (300 – x) = 15600 Or, 1.2x + 270 – 0.9x = 15600 / 50 = 312 Or, 0.3x = 42 Or, x = 140
- 25, 32, 47, 77, 126, 198 
- Find the wrong number in the given number series. - 24, 120, 721, 5040, 40320, 362880 
- Find the wrong number in the given number series. 
 630, 180, 60, 24, 12, 8, 5
- 12, 220, 322, 376, 402, 415 
- 1137, 1138, 1142, 1151, 1185, 1310 
- 32, 46, 88, 158, 256, 380 
- 186, 179, 170, 162, 146, 131, 114 
- Find the wrong number in the given number series. - 10, 17, 26, 39, 59, 85 
- 12, 28, 64, 128, 228, 379 
- Find the wrong number in given number series. - 2835, 3460, 3335, 3360, 3354, 3356