PSLE The airmail rates to two countries are shown. Elyse sent a letter weighing 79g to Vietnam and a letter weighing 27g to India by airmail. How much did she pay altogether?
Mass |
Vietnam |
India |
First 30g |
$0.85 |
$1.10 |
Every additional 15g |
$0.65 |
$0.35 |
Mass of the letter to Vietnam excluding the first 30 g
= 79 - 30
= 49 g
Sets of additional 15 g of the letter to Vietnam
= 49 ÷ 15
= 3 r 4
Sets of additional 15 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Elyse paid for the letter to Vietnam
= 0.85 + 4 x 0.65
= 0.85 + 2.60
= $3.45
Amount that Elyse paid altogether
= 3.45 + 1.10
= $4.55
Answer(s): $4.55