PSLE The airmail rates to two countries are shown. Dana sent a letter weighing 74g to Indonesia and a letter weighing 37g to India by airmail. How much did she pay altogether?
Mass |
Indonesia |
India |
First 40g |
$0.55 |
$1.60 |
Every additional 20g |
$0.35 |
$0.60 |
Mass of the letter to Indonesia excluding the first 40 g
= 74 - 40
= 34 g
Sets of additional 20 g of the letter to Indonesia
= 34 ÷ 20
= 1 r 14
Sets of additional 20 g and part thereof the letter to Indonesia
= 1 + 1
= 2
Amount that Dana paid for the letter to Indonesia
= 0.55 + 2 x 0.35
= 0.55 + 0.70
= $1.25
Amount that Dana paid altogether
= 1.25 + 1.60
= $2.85
Answer(s): $2.85