PSLE The airmail rates to two countries are shown. Natalie sent a letter weighing 83g to Malaysia and a letter weighing 20g to China by airmail. How much did she pay altogether?
Mass |
Malaysia |
China |
First 30g |
$0.85 |
$1.60 |
Every additional 15g |
$0.55 |
$0.60 |
Mass of the letter to Malaysia excluding the first 30 g
= 83 - 30
= 53 g
Sets of additional 15 g of the letter to Malaysia
= 53 ÷ 15
= 3 r 8
Sets of additional 15 g and part thereof the letter to Malaysia
= 3 + 1
= 4
Amount that Natalie paid for the letter to Malaysia
= 0.85 + 4 x 0.55
= 0.85 + 2.20
= $3.05
Amount that Natalie paid altogether
= 3.05 + 1.60
= $4.65
Answer(s): $4.65