PSLE The airmail rates to two countries are shown. Jaslyn sent a letter weighing 85g to Thailand and a letter weighing 41g to Australia by airmail. How much did she pay altogether?
Mass |
Thailand |
Australia |
First 50g |
$0.85 |
$1.50 |
Every additional 25g |
$0.55 |
$0.65 |
Mass of the letter to Thailand excluding the first 50 g
= 85 - 50
= 35 g
Sets of additional 25 g of the letter to Thailand
= 35 ÷ 25
= 1 r 10
Sets of additional 25 g and part thereof the letter to Thailand
= 1 + 1
= 2
Amount that Jaslyn paid for the letter to Thailand
= 0.85 + 2 x 0.55
= 0.85 + 1.10
= $1.95
Amount that Jaslyn paid altogether
= 1.95 + 1.50
= $3.45
Answer(s): $3.45