PSLE The airmail rates to two countries are shown. Elyse sent a letter weighing 99g to Phillippines and a letter weighing 36g to China by airmail. How much did she pay altogether?
Mass |
Phillippines |
China |
First 40g |
$0.65 |
$1.60 |
Every additional 20g |
$0.45 |
$0.70 |
Mass of the letter to Phillippines excluding the first 40 g
= 99 - 40
= 59 g
Sets of additional 20 g of the letter to Phillippines
= 59 ÷ 20
= 2 r 19
Sets of additional 20 g and part thereof the letter to Phillippines
= 2 + 1
= 3
Amount that Elyse paid for the letter to Phillippines
= 0.65 + 3 x 0.45
= 0.65 + 1.35
= $2.00
Amount that Elyse paid altogether
= 2.00 + 1.60
= $3.60
Answer(s): $3.60