PSLE The airmail rates to two countries are shown. Abi sent a letter weighing 90g to Indonesia and a letter weighing 44g to Sweden by airmail. How much did she pay altogether?
Mass |
Indonesia |
Sweden |
First 50g |
$0.75 |
$1.20 |
Every additional 25g |
$0.55 |
$0.40 |
Mass of the letter to Indonesia excluding the first 50 g
= 90 - 50
= 40 g
Sets of additional 25 g of the letter to Indonesia
= 40 ÷ 25
= 1 r 15
Sets of additional 25 g and part thereof the letter to Indonesia
= 1 + 1
= 2
Amount that Abi paid for the letter to Indonesia
= 0.75 + 2 x 0.55
= 0.75 + 1.10
= $1.85
Amount that Abi paid altogether
= 1.85 + 1.20
= $3.05
Answer(s): $3.05