A sum invested at a certain rate of interest per annum, compounded annually, amounts to ₹3,600 in 2 years and to ₹6,480 in 4 years. What is the sum invested?
If a person travels a certain distance at a speed of 10 km/h, and returns through the same route at a speed of 20 km/h, then what will be the average speed during the whole journey?
\( \frac{40}{3} \,\text{km/h} \)
15 km/h
\( \frac{10}{3} \,\text{km/h} \)
\( \frac{20}{3} \,\text{km/h} \)
A supermarket has sales of ₹1,48,500, ₹2,00,000, ₹1,64,000, ₹1,88,600 and ₹2,40,400 in 5 consecutive months. How much sales should the supermarket have in the month so that the average sales for these 6 months become ₹1,88,300?
There is a profit of 10% when an item is sold at \(\frac{5}{6}\) of its actual selling price. What will be the profit percentage on the cost price when the item is sold at its actual selling price?