Maths Quiz on Interest and Percentages

Carlos invests $4540 at a rate of r% per year compound interest. At the end of 10 years he has earned $1328.54 in interest. Calculate the value of r.

The price of a coat is $126. In a sale, this price is reduced by 18%. Find the sale price of the coat.

Feri invests some money. The rate of interest for the first year is 2.5%. At the end of the second year the overall percentage increase of Feri’s investment is 6.6%. Find the rate of interest for the second year.

In a sale, a shop reduces all prices by 12%. Dina buys a book which has an original price of $6.50. Calculate how much Dina pays for the book.

Elu pays $11 for a toy. Calculate the original price of the toy.

Use the frequency table to complete this cumulative frequency table. Calculate the percentage of children with a mass greater than 10 kg.

Arno buys a student ticket for $43.68. This is a saving of 16% on the full price of a ticket. Calculate the full price of a ticket.

Using the table, find the number of tigers in Nepal as a percentage of the number of tigers in Bangladesh.

Find the ratio tigers in Bangladesh : tigers in Indonesia : tigers in India, giving your answer in its simplest form.

Five years later, the number of tigers reported in India was 2967. Find the percentage increase in the population of tigers in India.