PSLE The airmail rates to two countries are shown. Dana sent a letter weighing 79g to Phillippines and a letter weighing 30g to Egypt by airmail. How much did she pay altogether?
Mass |
Phillippines |
Egypt |
First 40g |
$0.95 |
$1.80 |
Every additional 20g |
$0.65 |
$0.70 |
Mass of the letter to Phillippines excluding the first 40 g
= 79 - 40
= 39 g
Sets of additional 20 g of the letter to Phillippines
= 39 ÷ 20
= 1 r 19
Sets of additional 20 g and part thereof the letter to Phillippines
= 1 + 1
= 2
Amount that Dana paid for the letter to Phillippines
= 0.95 + 2 x 0.65
= 0.95 + 1.30
= $2.25
Amount that Dana paid altogether
= 2.25 + 1.80
= $4.05
Answer(s): $4.05