PSLE The airmail rates to two countries are shown. Kathy sent a letter weighing 73g to Indonesia and a letter weighing 38g to France by airmail. How much did she pay altogether?
Mass |
Indonesia |
France |
First 40g |
$0.55 |
$1.20 |
Every additional 20g |
$0.15 |
$0.40 |
Mass of the letter to Indonesia excluding the first 40 g
= 73 - 40
= 33 g
Sets of additional 20 g of the letter to Indonesia
= 33 ÷ 20
= 1 r 13
Sets of additional 20 g and part thereof the letter to Indonesia
= 1 + 1
= 2
Amount that Kathy paid for the letter to Indonesia
= 0.55 + 2 x 0.15
= 0.55 + 0.30
= $0.85
Amount that Kathy paid altogether
= 0.85 + 1.20
= $2.05
Answer(s): $2.05