PSLE The airmail rates to two countries are shown. Esther sent a letter weighing 80g to Malaysia and a letter weighing 40g to Australia by airmail. How much did she pay altogether?
Mass |
Malaysia |
Australia |
First 50g |
$0.65 |
$1.60 |
Every additional 25g |
$0.25 |
$0.70 |
Mass of the letter to Malaysia excluding the first 50 g
= 80 - 50
= 30 g
Sets of additional 25 g of the letter to Malaysia
= 30 ÷ 25
= 1 r 5
Sets of additional 25 g and part thereof the letter to Malaysia
= 1 + 1
= 2
Amount that Esther paid for the letter to Malaysia
= 0.65 + 2 x 0.25
= 0.65 + 0.50
= $1.15
Amount that Esther paid altogether
= 1.15 + 1.60
= $2.75
Answer(s): $2.75