PSLE The airmail rates to two countries are shown. Dana sent a letter weighing 95g to Indonesia and a letter weighing 38g to Switzerland by airmail. How much did she pay altogether?
Mass |
Indonesia |
Switzerland |
First 40g |
$0.55 |
$1.30 |
Every additional 20g |
$0.25 |
$0.55 |
Mass of the letter to Indonesia excluding the first 40 g
= 95 - 40
= 55 g
Sets of additional 20 g of the letter to Indonesia
= 55 ÷ 20
= 2 r 15
Sets of additional 20 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Dana paid for the letter to Indonesia
= 0.55 + 3 x 0.25
= 0.55 + 0.75
= $1.30
Amount that Dana paid altogether
= 1.30 + 1.30
= $2.60
Answer(s): $2.60