PSLE The airmail rates to two countries are shown. Zara sent a letter weighing 92g to Malaysia and a letter weighing 31g to Canada by airmail. How much did she pay altogether?
Mass |
Malaysia |
Canada |
First 40g |
$0.75 |
$1.70 |
Every additional 20g |
$0.35 |
$0.65 |
Mass of the letter to Malaysia excluding the first 40 g
= 92 - 40
= 52 g
Sets of additional 20 g of the letter to Malaysia
= 52 ÷ 20
= 2 r 12
Sets of additional 20 g and part thereof the letter to Malaysia
= 2 + 1
= 3
Amount that Zara paid for the letter to Malaysia
= 0.75 + 3 x 0.35
= 0.75 + 1.05
= $1.80
Amount that Zara paid altogether
= 1.80 + 1.70
= $3.50
Answer(s): $3.50