PSLE The airmail rates to two countries are shown. Tiffany sent a letter weighing 87g to Vietnam and a letter weighing 24g to New Zealand by airmail. How much did she pay altogether?
Mass |
Vietnam |
New Zealand |
First 30g |
$0.75 |
$1.20 |
Every additional 15g |
$0.45 |
$0.30 |
Mass of the letter to Vietnam excluding the first 30 g
= 87 - 30
= 57 g
Sets of additional 15 g of the letter to Vietnam
= 57 ÷ 15
= 3 r 12
Sets of additional 15 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Tiffany paid for the letter to Vietnam
= 0.75 + 4 x 0.45
= 0.75 + 1.80
= $2.55
Amount that Tiffany paid altogether
= 2.55 + 1.20
= $3.75
Answer(s): $3.75