Cambridge Essentials Mathematics Core 8 N2.3 Homework2

/ N2.3 Homework2

You may use a calculator to answer these questions.

1Calculate the new values.

a£45 is increased by 20%b£56 is increased by 12%

c£123 is increased by 36%d£75 is reduced by 80%

e£156 is reduced by 88%f£189 is reduced by 19%

2Gas prices rose by 13% in a year. Find the new cost of gas that originally cost£1028.

3In 2000, the number of barrels of oil produced daily in Saudi Arabia was 9145000.
By 2008 it had increased its production by 5%.

aComplete these statements.

The number of barrels of oil produced daily in 2008 will be % of the number produced in 2000. As a fraction, this percentage is equivalent to .

bWork out the number of barrels of oil produced daily in 2008.

4Last year £3100 was raised by a school in a sponsored spell.

aThis year the amount raised was 7% more than last year.
How much money was raised this year?

b29% of the money raised last year was raised by year 8 pupils.
How much money did year 8 pupils raise last year?

5Marty wants to buy a plasma-screen TV that costs £1380.

He can payeitherAa deposit of 10% and 24 equal monthly payments of £60
orBa deposit of 20% and 12 equal monthly payments of £100

aHow much is the deposit of 10%?

bWhat is the total of the 24 payments of £60?

cHow much does he pay altogether if he chooses option A?

dWork out how much he pays altogether if he chooses option B.

eWhich option is cheaper, and by how much?

6Leroy bought a house for £210000. Six months later, the value increased by 5%.
Six months after that, the value decreased by 5%.

Is the value of the house the same as when he bought it?Explain how you decided.