PSLE The airmail rates to two countries are shown. Fiona sent a letter weighing 71g to Thailand and a letter weighing 16g to France by airmail. How much did she pay altogether?
Mass |
Thailand |
France |
First 20g |
$0.75 |
$1.10 |
Every additional 10g |
$0.35 |
$0.25 |
Mass of the letter to Thailand excluding the first 20 g
= 71 - 20
= 51 g
Sets of additional 10 g of the letter to Thailand
= 51 ÷ 10
= 5 r 1
Sets of additional 10 g and part thereof the letter to Thailand
= 5 + 1
= 6
Amount that Fiona paid for the letter to Thailand
= 0.75 + 6 x 0.35
= 0.75 + 2.10
= $2.85
Amount that Fiona paid altogether
= 2.85 + 1.10
= $3.95
Answer(s): $3.95