A trader paid a debt in 6 weekly installments as follows. The first week he pays N2, the second twice this, the third three times the first and so on. How much was the debt?

Question

A trader paid a debt in 6 weekly installments as follows. The first week he pays N2, the second twice this, the third three times the first and so on. How much was the debt?
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First week: N2 Second week: 2 x N2 = N4 Third week: 3 x N2 = N6 Fourth week: 4 x N2 = N8 Fifth week: 5 x N2 = N10 Sixth week: 6 x N2 = N12 Total debt = N2 + N4 + N6 + N8 + N10 + N12 = N42