PSLE The airmail rates to two countries are shown. Min sent a letter weighing 84g to Phillippines and a letter weighing 28g to India by airmail. How much did she pay altogether?
Mass |
Phillippines |
India |
First 30g |
$0.55 |
$1.70 |
Every additional 15g |
$0.15 |
$0.75 |
Mass of the letter to Phillippines excluding the first 30 g
= 84 - 30
= 54 g
Sets of additional 15 g of the letter to Phillippines
= 54 ÷ 15
= 3 r 9
Sets of additional 15 g and part thereof the letter to Phillippines
= 3 + 1
= 4
Amount that Min paid for the letter to Phillippines
= 0.55 + 4 x 0.15
= 0.55 + 0.60
= $1.15
Amount that Min paid altogether
= 1.15 + 1.70
= $2.85
Answer(s): $2.85