PSLE The airmail rates to two countries are shown. Linda sent a letter weighing 81g to Vietnam and a letter weighing 23g to France by airmail. How much did she pay altogether?
Mass |
Vietnam |
France |
First 30g |
$0.85 |
$1.10 |
Every additional 15g |
$0.55 |
$0.45 |
Mass of the letter to Vietnam excluding the first 30 g
= 81 - 30
= 51 g
Sets of additional 15 g of the letter to Vietnam
= 51 ÷ 15
= 3 r 6
Sets of additional 15 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Linda paid for the letter to Vietnam
= 0.85 + 4 x 0.55
= 0.85 + 2.20
= $3.05
Amount that Linda paid altogether
= 3.05 + 1.10
= $4.15
Answer(s): $4.15