A man buys a toy for ₹400 and sells it at a loss of 15%. What is the selling price of the toy?
S1 and S2 can do a piece of work together in 18 days, S2 and S3 can do the same work together in 27 days, while S3 and S1 can do it together in 54 days. In how many days can all 3, working together, do 50% of the work?
Karun borrowed ₹12,000 from Varun and ₹15,000 from Tarun, each for two years at the same rate of simple interest per annum. If he paid an interest of ₹1,680 to Varun at the end of 2 years, then what is the interest that Karun paid to Tarun at the end of the 2-year period?
Find the curved surface area of a cone whose radius of base is 7 cm and slant height is 8 cm. \( \text{use } \pi = \frac{22}{7} \)