Suppose That a Computer Takes $10^{-7}$ Seconds to Add Two Numbers Together, and It Takes

Suppose that a computer takes $10^{-7}$ seconds to add two numbers together, and it takes $10^{-5}$ seconds to multiply two numbers together.The computer is asked to integrate the function $f(x) =3 \cdot x^{2}$ from 0 to 1 using left hand sums with n divisions.As a function of n, let T(n) denote the time used by the computer to do the calculation.Compute T(n) .(The computer figures x² as x · x.)

A) $2 n \times 10^{-5}+(n-1) \times 10^{-7}$
B) $2 n \times 10^{-7}+2(n-1) \times 10^{-5}$
C) $n \times 10^{-5}+n \times 10^{-7}$
D) $n \times 10^{-5}+2 n \times 10^{-7}$