PSLE The airmail rates to two countries are shown. Gabby sent a letter weighing 81g to Indonesia and a letter weighing 38g to Sweden by airmail. How much did she pay altogether?
Mass |
Indonesia |
Sweden |
First 40g |
$0.85 |
$1.90 |
Every additional 20g |
$0.55 |
$0.75 |
Mass of the letter to Indonesia excluding the first 40 g
= 81 - 40
= 41 g
Sets of additional 20 g of the letter to Indonesia
= 41 ÷ 20
= 2 r 1
Sets of additional 20 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Gabby paid for the letter to Indonesia
= 0.85 + 3 x 0.55
= 0.85 + 1.65
= $2.50
Amount that Gabby paid altogether
= 2.50 + 1.90
= $4.40
Answer(s): $4.40