The cost of a calculator is Rs 750. The sales tax is charged 5%.. Find the bill amount.

A computer monitor is marked at Rs 15600 and it is available for Rs 11880. Find the discount given and discount per cent.

A man got a 12% increased in his salary. If his new salary is Rs 31360. Then find his original salary.

If the cost of an article is Rs 20500 and Rs 7500 was spent on its repairs. If it is sold for a profit of 12%, then find the selling price of the article.

Find the compound interest of Rs 18000 for 2 years at 5% per annum compounded annually.

Find the population of a city after 2 years, which is at present is 20 lakh, if the rate of increase is 5% p.a.

In a primary school, the parents were asked about the number of hours they spend per day in helping their children to do homework. There were 90 parents who helped for ¹/₂ hour to 1¹/₂ hours. The distribution of parents according to the time for which, they said they helped is given in the adjoining figure; 20% helped for more than hours per day; 30% helped for ¹/₂ hour to 1¹/₂ hours; 50% did not help at all.

Using this, answer the following:

(i) How many parents were surveyed?

(ii) How many said that they did not help?

(iii) How many said that they helped for more than 1¹/₂ hours?

Find the ratio of the following:

Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.

Find the ratio of the following:

5 m to 10 km

Find the ratio of the following:

50 paise to Rs 5