PSLE The airmail rates to two countries are shown. Irene sent a letter weighing 71g to Malaysia and a letter weighing 16g to France by airmail. How much did she pay altogether?
Mass |
Malaysia |
France |
First 20g |
$0.65 |
$1.50 |
Every additional 10g |
$0.25 |
$0.55 |
Mass of the letter to Malaysia excluding the first 20 g
= 71 - 20
= 51 g
Sets of additional 10 g of the letter to Malaysia
= 51 ÷ 10
= 5 r 1
Sets of additional 10 g and part thereof the letter to Malaysia
= 5 + 1
= 6
Amount that Irene paid for the letter to Malaysia
= 0.65 + 6 x 0.25
= 0.65 + 1.50
= $2.15
Amount that Irene paid altogether
= 2.15 + 1.50
= $3.65
Answer(s): $3.65