For every 200 books Johnson sells, he earns $8. He will receive an addition of $20 for every 3000 books sold. How many books must he sell to earn $700?
Solution
1 group of 200 books --> $8
3000 books divided by 200 books --> 15 groups of 200 books
15 groups of 200 books
--> 15 x $8 + $20 commission
= $120 + $20
= $140
To earn $700,
$700 divided by $140 --> 5 groups of $140
1 group of $140
--> 15 groups of 200 books
5 groups of $140 --> 5 x 15 groups of 200 books
=75 groups of 200 books
75 groups of 200 books
--> 75 x 200 books
= 15 000 books
Answer: 15 000 books
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