PSLE The airmail rates to two countries are shown. Linda sent a letter weighing 75g to Malaysia and a letter weighing 10g to China by airmail. How much did she pay altogether?
Mass |
Malaysia |
China |
First 20g |
$0.55 |
$1.60 |
Every additional 10g |
$0.15 |
$0.70 |
Mass of the letter to Malaysia excluding the first 20 g
= 75 - 20
= 55 g
Sets of additional 10 g of the letter to Malaysia
= 55 ÷ 10
= 5 r 5
Sets of additional 10 g and part thereof the letter to Malaysia
= 5 + 1
= 6
Amount that Linda paid for the letter to Malaysia
= 0.55 + 6 x 0.15
= 0.55 + 0.90
= $1.45
Amount that Linda paid altogether
= 1.45 + 1.60
= $3.05
Answer(s): $3.05