PSLE The airmail rates to two countries are shown. Anna sent a letter weighing 67g to Thailand and a letter weighing 29g to Egypt by airmail. How much did she pay altogether?
Mass |
Thailand |
Egypt |
First 30g |
$0.85 |
$1.20 |
Every additional 15g |
$0.55 |
$0.50 |
Mass of the letter to Thailand excluding the first 30 g
= 67 - 30
= 37 g
Sets of additional 15 g of the letter to Thailand
= 37 ÷ 15
= 2 r 7
Sets of additional 15 g and part thereof the letter to Thailand
= 2 + 1
= 3
Amount that Anna paid for the letter to Thailand
= 0.85 + 3 x 0.55
= 0.85 + 1.65
= $2.50
Amount that Anna paid altogether
= 2.50 + 1.20
= $3.70
Answer(s): $3.70