PSLE The airmail rates to two countries are shown. Jaslyn sent a letter weighing 71g to Phillippines and a letter weighing 13g to Egypt by airmail. How much did she pay altogether?
Mass |
Phillippines |
Egypt |
First 20g |
$0.85 |
$1.80 |
Every additional 10g |
$0.55 |
$0.70 |
Mass of the letter to Phillippines excluding the first 20 g
= 71 - 20
= 51 g
Sets of additional 10 g of the letter to Phillippines
= 51 ÷ 10
= 5 r 1
Sets of additional 10 g and part thereof the letter to Phillippines
= 5 + 1
= 6
Amount that Jaslyn paid for the letter to Phillippines
= 0.85 + 6 x 0.55
= 0.85 + 3.30
= $4.15
Amount that Jaslyn paid altogether
= 4.15 + 1.80
= $5.95
Answer(s): $5.95