What value of a makes the equation true?
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C
the sum to infinity of a geometric series =
where a is the first term and r the common ratio
= = 81 × 3 = 243
Multiply 50 by 0.90 because you take a discount of 10% off. 1.00 = 100% 0.10 = 10% 0.01 = 1% if you multiply 50 by 0.10 instead you get the amount that is discounted instead of the new selling price.