It is: 8n(5n+8)
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131. The rule is Un = (8n3 - 36n2 + 64n - 27)/3 for n = 1, 2, 3, ...
64n = 25n is the percentage, so, we solve for it. In the above equation, dividing by 64 is the most suitable.n = 25/64Simplifying into a percent, we have:0.390625 = 39.0625%.