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How to Calculate When Bonus Cards Amortize

How to Calculate When Bonus Cards Amortize

Assume a bus ticket costs 21 pounds, but with a bonus card for 40 pounds only half the price.

How many bus tickets must i buy, that i economise the price for the boni?

We translate this question into a mathematical inequation:

x * 21 >= 40 + x * 10.5

and solve it by paper or screen:

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