Let the sum of an infinite G.P., whose first term is a and the common ratio is r, be 5. Let the sum

Let the sum of an infinite G.P., whose first term is a and the common ratio is r, be 5. Let the sum of its first five terms be 98 /25 . Then the sum of the first 21 terms of an AP, whose first term is 10ar, nth term is an and the common difference is 10ar^2, is equal to:
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