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Gopal invests a sum of ₹5400 and Akshay invests a sum of ₹9400 at the same rate of simple interest per annum. If, at the end of 6 years, Akshay gets ₹720 more interest than Gopal, then find the rate of interest per annum (in percentage).

A car dealer sold three cars, A, B, and C, whose selling prices were in the ratio 5 : 4 : 6. He made a profit of 50% on car A, a loss of 10% on car B, and an equal loss (no profit or loss) on car C. What was his approximate profit or loss percentage on the total transaction?

A cylinder (r = 8 cm, h = 20 cm) is bored through by a hole (r = 4 cm, full height). What percentage of original volume is removed?

A shop sells a shirt for ₹P, incurring a loss of 10%. They mark it up to ₹1.8P and then provide a 20% discount. What is the percentage profit or loss?

A Smart watch retailer sells a Smart watch for ₹P and earns a profit of 20%. For a special festive offer, he marks the same Smart watch at ₹1.5P. At the offer, he provides a discount of 10%. What will be the percentage profit that he will make during the festive offer?

A fruit vendor sells 20 kg of oranges for ₹900, thereby gaining the cost price of 5 kg of oranges. What is his profit percentage?

A refrigerator has a marked price of ₹15,000. It is sold with two successive discounts. If the second discount is 30% and the final selling price is ₹9,000, what is the percentage of the first discount?

If all three dimensions of a cuboid are increased by 25%, the volume increases by what percentage?

A retailer marked a commodity at 25% above its cost price and then gave a discount. If the sale finally yielded a profit of 20% on the cost price, what was the discount percentage?

A mixture of 200 litres contains acid and water in the ratio 3 : 5. If 40 litres of the mixture is replaced with water, what will be the percentage of acid in the final mixture?

A man spends 70% of his income. His income increases by 15% and his expenditure by 10%. What is the percentage increase in his savings?

If the radius of a sphere is increased by 10 percent, by what percentage will its volume increase?

If equal quantities of two types of wheat are mixed, where the first is sold for $₹60/\mathrm{kg}$ at a $25\%$ profit, and the second is sold for ₹36/kg at a 25% loss. If the mixture is sold at ₹48/kg, what is the loss or gain percentage ?

A trader buys 220 mixed stationery boxes at a rate of ₹160 each. He spends ₹1,600 on transportation and packaging. He sells 120 boxes at ₹180 each and the remaining at ₹170 each. What is his total profit percentage?

P does $\frac{1}{4}$ of work in 10 days, Q completes $\frac{1}{5}$ of the same in 12 days. Who is more efficient and by what percentage?

During 1991, India carried out a two-step devaluation of the rupee. What was the approximate total percentage devaluation against the US dollar ?

Amit invests a sum of ₹5400 and Gopal invests a sum of ₹9400 at the same rate of simple interest per annum. If, at the end of 4 years, Gopal gets ₹480 more interest than Amit, then find the rate of interest per annum (in percentage).

A dishonest shopkeeper promises to sell his goods at cost price. However, he uses a weight that actually weighs $21\%$ less than what is written on it. Find his profit percentage.