PSLE The airmail rates to two countries are shown. Fiona sent a letter weighing 98g to Indonesia and a letter weighing 33g to Australia by airmail. How much did she pay altogether?
Mass |
Indonesia |
Australia |
First 40g |
$0.75 |
$1.50 |
Every additional 20g |
$0.35 |
$0.55 |
Mass of the letter to Indonesia excluding the first 40 g
= 98 - 40
= 58 g
Sets of additional 20 g of the letter to Indonesia
= 58 ÷ 20
= 2 r 18
Sets of additional 20 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Fiona paid for the letter to Indonesia
= 0.75 + 3 x 0.35
= 0.75 + 1.05
= $1.80
Amount that Fiona paid altogether
= 1.80 + 1.50
= $3.30
Answer(s): $3.30