PSLE The airmail rates to two countries are shown. Gabby sent a letter weighing 77g to Thailand and a letter weighing 25g to Australia by airmail. How much did she pay altogether?
Mass |
Thailand |
Australia |
First 30g |
$0.95 |
$1.40 |
Every additional 15g |
$0.55 |
$0.50 |
Mass of the letter to Thailand excluding the first 30 g
= 77 - 30
= 47 g
Sets of additional 15 g of the letter to Thailand
= 47 ÷ 15
= 3 r 2
Sets of additional 15 g and part thereof the letter to Thailand
= 3 + 1
= 4
Amount that Gabby paid for the letter to Thailand
= 0.95 + 4 x 0.55
= 0.95 + 2.20
= $3.15
Amount that Gabby paid altogether
= 3.15 + 1.40
= $4.55
Answer(s): $4.55