PSLE The airmail rates to two countries are shown. Jean sent a letter weighing 109g to Malaysia and a letter weighing 42g to Australia by airmail. How much did she pay altogether?
Mass |
Malaysia |
Australia |
First 50g |
$0.75 |
$1.30 |
Every additional 25g |
$0.45 |
$0.35 |
Mass of the letter to Malaysia excluding the first 50 g
= 109 - 50
= 59 g
Sets of additional 25 g of the letter to Malaysia
= 59 ÷ 25
= 2 r 9
Sets of additional 25 g and part thereof the letter to Malaysia
= 2 + 1
= 3
Amount that Jean paid for the letter to Malaysia
= 0.75 + 3 x 0.45
= 0.75 + 1.35
= $2.10
Amount that Jean paid altogether
= 2.10 + 1.30
= $3.40
Answer(s): $3.40