History of Hindu Mathematics: A Source Book v1.c8.s13.15

v1.c8.s13.15

"Multiply the sum of the interest on the principal and the interest on this interest (A) by the time (t) and by the principal (p). Add to this result the square of half the principal (p/2)². Take the square-root of this. Subtract half the principal (p/2) and divide the remainder by the time (t). The result will be the (unknown) interest (x) on the principal."¹