PSLE The airmail rates to two countries are shown. Olivia sent a letter weighing 102g to Thailand and a letter weighing 47g to New Zealand by airmail. How much did she pay altogether?
Mass |
Thailand |
New Zealand |
First 50g |
$0.55 |
$1.40 |
Every additional 25g |
$0.25 |
$0.40 |
Mass of the letter to Thailand excluding the first 50 g
= 102 - 50
= 52 g
Sets of additional 25 g of the letter to Thailand
= 52 ÷ 25
= 2 r 2
Sets of additional 25 g and part thereof the letter to Thailand
= 2 + 1
= 3
Amount that Olivia paid for the letter to Thailand
= 0.55 + 3 x 0.25
= 0.55 + 0.75
= $1.30
Amount that Olivia paid altogether
= 1.30 + 1.40
= $2.70
Answer(s): $2.70