PSLE The airmail rates to two countries are shown. Betty sent a letter weighing 94g to Indonesia and a letter weighing 32g to Sweden by airmail. How much did she pay altogether?
Mass |
Indonesia |
Sweden |
First 40g |
$0.75 |
$1.10 |
Every additional 20g |
$0.35 |
$0.35 |
Mass of the letter to Indonesia excluding the first 40 g
= 94 - 40
= 54 g
Sets of additional 20 g of the letter to Indonesia
= 54 ÷ 20
= 2 r 14
Sets of additional 20 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Betty paid for the letter to Indonesia
= 0.75 + 3 x 0.35
= 0.75 + 1.05
= $1.80
Amount that Betty paid altogether
= 1.80 + 1.10
= $2.90
Answer(s): $2.90