PSLE The airmail rates to two countries are shown. Kylie sent a letter weighing 77g to Indonesia and a letter weighing 32g to Australia by airmail. How much did she pay altogether?
Mass |
Indonesia |
Australia |
First 40g |
$0.75 |
$1.80 |
Every additional 20g |
$0.35 |
$0.60 |
Mass of the letter to Indonesia excluding the first 40 g
= 77 - 40
= 37 g
Sets of additional 20 g of the letter to Indonesia
= 37 ÷ 20
= 1 r 17
Sets of additional 20 g and part thereof the letter to Indonesia
= 1 + 1
= 2
Amount that Kylie paid for the letter to Indonesia
= 0.75 + 2 x 0.35
= 0.75 + 0.70
= $1.45
Amount that Kylie paid altogether
= 1.45 + 1.80
= $3.25
Answer(s): $3.25