PSLE The airmail rates to two countries are shown. Gem sent a letter weighing 76g to Phillippines and a letter weighing 16g to Egypt by airmail. How much did she pay altogether?
Mass |
Phillippines |
Egypt |
First 20g |
$0.85 |
$1.80 |
Every additional 10g |
$0.65 |
$0.70 |
Mass of the letter to Phillippines excluding the first 20 g
= 76 - 20
= 56 g
Sets of additional 10 g of the letter to Phillippines
= 56 ÷ 10
= 5 r 6
Sets of additional 10 g and part thereof the letter to Phillippines
= 5 + 1
= 6
Amount that Gem paid for the letter to Phillippines
= 0.85 + 6 x 0.65
= 0.85 + 3.90
= $4.75
Amount that Gem paid altogether
= 4.75 + 1.80
= $6.55
Answer(s): $6.55