PSLE The airmail rates to two countries are shown. Gem sent a letter weighing 65g to Indonesia and a letter weighing 21g to Sweden by airmail. How much did she pay altogether?
Mass |
Indonesia |
Sweden |
First 30g |
$0.65 |
$1.20 |
Every additional 15g |
$0.35 |
$0.40 |
Mass of the letter to Indonesia excluding the first 30 g
= 65 - 30
= 35 g
Sets of additional 15 g of the letter to Indonesia
= 35 ÷ 15
= 2 r 5
Sets of additional 15 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Gem paid for the letter to Indonesia
= 0.65 + 3 x 0.35
= 0.65 + 1.05
= $1.70
Amount that Gem paid altogether
= 1.70 + 1.20
= $2.90
Answer(s): $2.90