PSLE The airmail rates to two countries are shown. Yoko sent a letter weighing 70g to Indonesia and a letter weighing 34g to India by airmail. How much did she pay altogether?
Mass |
Indonesia |
India |
First 40g |
$0.65 |
$1.60 |
Every additional 20g |
$0.25 |
$0.60 |
Mass of the letter to Indonesia excluding the first 40 g
= 70 - 40
= 30 g
Sets of additional 20 g of the letter to Indonesia
= 30 ÷ 20
= 1 r 10
Sets of additional 20 g and part thereof the letter to Indonesia
= 1 + 1
= 2
Amount that Yoko paid for the letter to Indonesia
= 0.65 + 2 x 0.25
= 0.65 + 0.50
= $1.15
Amount that Yoko paid altogether
= 1.15 + 1.60
= $2.75
Answer(s): $2.75