Ratio, Percentage & Commercial Math — practice questions, page 4
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Ten years ago the ages of Kavita and her mother were in the ratio 1 : 7. Ten years from now their…The price of petrol goes up by 25%. Sameer raises his monthly spending on petrol by only 10%. By…A trader buys 120 identical clay mugs for ₹7200. On the way home 20 of them break. At what price…Find the compound interest (in ₹) on ₹16000 for 9 months at 20% per annum, compounded quarterly.A train 180 m long runs at 45 km/h and overtakes a man walking at 9 km/h in the same direction…Three successive discounts of 20%, 25% and 10% on the marked price are together equivalent to a…The sub-duplicate ratio of x : 81 is 2 : 3. The value of x is:In a town 25% of the people own a car, and 40% of those car owners also own a scooter. If 1800…Farhan barters 60 kg of rice that cost him ₹80 per kg for 50 kg of cashew whose market value is…Rohit and Sameer start together from the same point of a circular track 600 m round and run in…A sum of money invested at compound interest doubles itself in 5 years. In how many years will it…Aditya, Bharti and Chetan together finish a job in 6 days and are paid ₹5400 for it. Aditya alone…A single discount of 40% is exactly equivalent to two successive discounts of 25% and x%. The…Anjali's salary is 25% less than Bhavesh's salary. Bhavesh's salary is what percent more than…Rajat can row at 9 km/h in still water. He rows to a jetty 24 km upstream and comes straight back,…Sunil buys 30 kg of rice at ₹42 per kg and 50 kg of another variety at ₹34 per kg and mixes them.…₹5700 is divided among Anand, Bhavna and Chirag in inverse proportion to 4, 6 and 9. Anand's share…At what rate of simple interest per annum will a sum of money become three times itself in 16 years?When the numerator of a fraction is increased by 20% and its denominator is decreased by 25%, the…Anjali and Deepa start together from the same point of a circular track 900 m round and run in the…A fan is marked at ₹2400. The shopkeeper allows a discount of 15% on the marked price and still…12 men working 8 hours a day build a 60 m long wall in 15 days. How many days will 18 men working…By selling 20 pens for ₹100 a shopkeeper loses 10%. How many pens must he sell for ₹100 to gain 20%?An alloy weighing 80 kg contains 35% copper by weight. How many kilograms of pure copper must be…A train running at 72 km/h crosses an electric pole in 9 seconds and a bridge in 29 seconds. The…
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