PSLE The airmail rates to two countries are shown. Jean sent a letter weighing 75g to Indonesia and a letter weighing 11g to China by airmail. How much did she pay altogether?
Mass |
Indonesia |
China |
First 20g |
$0.95 |
$1.50 |
Every additional 10g |
$0.55 |
$0.45 |
Mass of the letter to Indonesia excluding the first 20 g
= 75 - 20
= 55 g
Sets of additional 10 g of the letter to Indonesia
= 55 ÷ 10
= 5 r 5
Sets of additional 10 g and part thereof the letter to Indonesia
= 5 + 1
= 6
Amount that Jean paid for the letter to Indonesia
= 0.95 + 6 x 0.55
= 0.95 + 3.30
= $4.25
Amount that Jean paid altogether
= 4.25 + 1.50
= $5.75
Answer(s): $5.75