PSLE The airmail rates to two countries are shown. Min sent a letter weighing 65g to Thailand and a letter weighing 15g to France by airmail. How much did she pay altogether?
Mass |
Thailand |
France |
First 20g |
$0.85 |
$1.30 |
Every additional 10g |
$0.55 |
$0.55 |
Mass of the letter to Thailand excluding the first 20 g
= 65 - 20
= 45 g
Sets of additional 10 g of the letter to Thailand
= 45 ÷ 10
= 4 r 5
Sets of additional 10 g and part thereof the letter to Thailand
= 4 + 1
= 5
Amount that Min paid for the letter to Thailand
= 0.85 + 5 x 0.55
= 0.85 + 2.75
= $3.60
Amount that Min paid altogether
= 3.60 + 1.30
= $4.90
Answer(s): $4.90