PSLE The airmail rates to two countries are shown. Eva sent a letter weighing 80g to Indonesia and a letter weighing 21g to Canada by airmail. How much did she pay altogether?
Mass |
Indonesia |
Canada |
First 30g |
$0.75 |
$1.60 |
Every additional 15g |
$0.35 |
$0.60 |
Mass of the letter to Indonesia excluding the first 30 g
= 80 - 30
= 50 g
Sets of additional 15 g of the letter to Indonesia
= 50 ÷ 15
= 3 r 5
Sets of additional 15 g and part thereof the letter to Indonesia
= 3 + 1
= 4
Amount that Eva paid for the letter to Indonesia
= 0.75 + 4 x 0.35
= 0.75 + 1.40
= $2.15
Amount that Eva paid altogether
= 2.15 + 1.60
= $3.75
Answer(s): $3.75