A student multiplies a number by 5/3 instead of 3/5. What is the percentage error in the calculation?

A furniture salesman increased the value of furniture by 20 percent due to the lure of more income, which led to a decrease of 30 percent in his sales, then tell him what percentage was reduced in his income?

If the income of A is 25% more than that of B, then by what percent is the income of B less than that of A?

The value of a machine depreciates at the rate of 10% per annum. It was purchased 3 years ago. If its present value is Rs.53071.20, the purchase price of the machine was:

A basket contains 300 mangoes. 75 Mangoes were distributed among some student. Find the percentage of mangoes left in the basket.

Two candidates contested an election. One of them got 64% of the votes and won by 434 votes. What was the total number of votes polled? 

The average monthly salary of all the employees in a company is ₹ 12,000. Among them the average salary of male employees is ₹15,000 and that of female employees is ₹8000. Accordingly, what is the ratio of male and female employees?

In an examination in which full marks were 700, A gets 20 % more than B, B gets 20 % more than C, and Cgets 15 % less than D. If A got 576 marks, then what percentage of full marks did D get?