Step 1: The man sells \(\frac{3}{4}\) of \(\frac{2}{3}\) of the business.
So, the total portion of the business he sold is:
\[
\frac{3}{4} \times \frac{2}{3} = \frac{1}{2}.
\]
Step 2: The value of the portion sold is Rs. 75000, which is half of the total value of the business.
So, the total value of the business is:
\[
2 \times 75000 = 150000.
\]