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Nothing goes into 13 evenly other than 1 and 13, so that means it is a prime number.
The rule is additive. The first pair of numbers in the series is added to create the next, thus: 4 + 9 = 13. Subsequently the new number generated (13) is added to the one preceding it (9) therefore 9 + 13 = 22. This continues, adding the new to the one immediately prior to is in this manner: 13 + 22 = 35, 22 + 35 = 57, 35 + 57 = 92 and so on.
1 km = 1000 metres so 35 km = 35000 m
A nickel is worth 5 cents so 7 of them are worth 7 * 5 = 35 cents.
10% = 1/10th so 10% of 35 is 3.5. Therefore 20% = 7. So the price minus the discount is 35 - 7 = 28