Units 13, 17 and 19

Bobby uses $250 of his share to open a bank account. This account pays compound interest at a rate of 1.6% per year. Calculate the amount in the bank after 3 years. Give your answer correct to 2 decimal places.

$ (a)  

*enter number only, do not include any symbol.

Carl buys a computer for $288 and sells it for $324. Calculate his percentage profit. (Give 1 decimal place.)

(a)   %

*enter number only, do not include any symbol.

Anna buys a coat in a sale for $64.68. This was 23% less than the original price.

Calculate the original price of the coat.

$ (a)  

*enter number only, do not include any symbol.

Cheng invested $4500 at a rate of 3.5% per year simple interest. Calculate the total amount he has after 5 years.

$ (a)  

*enter number only, do not include any symbol.

Identify the type of correlation between

the average speed of a train and the time taken for a journey.

• positive correlation

• negative correlation

• no correlation

Identify the type of correlation between

the distance travelled by a car and the amount of fuel used.

• positive correlation

• negative correlation

• no correlation

Change 6200 cm² into m²

^(a)   m²

*enter number only, do not include any symbol.

What is the upper bound and lower bound of 390 grams, measured to the nearest 10 grams?

• 385≤ m <395

• 389.5 ≤ m < 390.5

• 300 ≤ m < 400

• 350 ≤ m < 400

A metal pole is 500cm long, correct to the nearest centimetre. The pole is cut into rods each of length 5.8 cm, correct to the nearest millimetre.

Calculate the largest number of rods that the pole can be cut into.

(a)  

• 6am/10a

• 9

• 9ma/3a

• 6m