PSLE The airmail rates to two countries are shown. Lynn sent a letter weighing 71g to Malaysia and a letter weighing 36g to France by airmail. How much did she pay altogether?
Mass |
Malaysia |
France |
First 40g |
$0.75 |
$1.60 |
Every additional 20g |
$0.35 |
$0.70 |
Mass of the letter to Malaysia excluding the first 40 g
= 71 - 40
= 31 g
Sets of additional 20 g of the letter to Malaysia
= 31 ÷ 20
= 1 r 11
Sets of additional 20 g and part thereof the letter to Malaysia
= 1 + 1
= 2
Amount that Lynn paid for the letter to Malaysia
= 0.75 + 2 x 0.35
= 0.75 + 0.70
= $1.45
Amount that Lynn paid altogether
= 1.45 + 1.60
= $3.05
Answer(s): $3.05