PSLE The airmail rates to two countries are shown. Emma sent a letter weighing 84g to Indonesia and a letter weighing 23g to Canada by airmail. How much did she pay altogether?
Mass |
Indonesia |
Canada |
First 30g |
$0.85 |
$1.90 |
Every additional 15g |
$0.65 |
$0.65 |
Mass of the letter to Indonesia excluding the first 30 g
= 84 - 30
= 54 g
Sets of additional 15 g of the letter to Indonesia
= 54 ÷ 15
= 3 r 9
Sets of additional 15 g and part thereof the letter to Indonesia
= 3 + 1
= 4
Amount that Emma paid for the letter to Indonesia
= 0.85 + 4 x 0.65
= 0.85 + 2.60
= $3.45
Amount that Emma paid altogether
= 3.45 + 1.90
= $5.35
Answer(s): $5.35