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Based on the current score and the rate of increase, the score 5 months ago must have been 2.98.
Assume the score 5 months ago was x. This means that the above can be expressed as:
Current score = x × ( 1 + rate) ^ number of months
4.80 = x × (1 + 10%)⁵
4.8 = x × 1.1.61051
x = 4.8 / 1.61051
= 2.980
In conclusion, the score was 2.98.
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