PSLE The airmail rates to two countries are shown. Irene sent a letter weighing 84g to Malaysia and a letter weighing 25g to Australia by airmail. How much did she pay altogether?
Mass |
Malaysia |
Australia |
First 30g |
$0.95 |
$1.60 |
Every additional 15g |
$0.75 |
$0.50 |
Mass of the letter to Malaysia excluding the first 30 g
= 84 - 30
= 54 g
Sets of additional 15 g of the letter to Malaysia
= 54 ÷ 15
= 3 r 9
Sets of additional 15 g and part thereof the letter to Malaysia
= 3 + 1
= 4
Amount that Irene paid for the letter to Malaysia
= 0.95 + 4 x 0.75
= 0.95 + 3.00
= $3.95
Amount that Irene paid altogether
= 3.95 + 1.60
= $5.55
Answer(s): $5.55