PSLE The airmail rates to two countries are shown. Elyse sent a letter weighing 81g to Thailand and a letter weighing 23g to Egypt by airmail. How much did she pay altogether?
Mass |
Thailand |
Egypt |
First 30g |
$0.95 |
$1.90 |
Every additional 15g |
$0.65 |
$0.65 |
Mass of the letter to Thailand excluding the first 30 g
= 81 - 30
= 51 g
Sets of additional 15 g of the letter to Thailand
= 51 ÷ 15
= 3 r 6
Sets of additional 15 g and part thereof the letter to Thailand
= 3 + 1
= 4
Amount that Elyse paid for the letter to Thailand
= 0.95 + 4 x 0.65
= 0.95 + 2.60
= $3.55
Amount that Elyse paid altogether
= 3.55 + 1.90
= $5.45
Answer(s): $5.45