Step 1: Separate credit revenue.
Let credit revenue be ₹ x. Then cash revenue = 0.25x.
So total revenue = \(x + 0.25x = 1.25x = 4,00,000 \Rightarrow x = ₹3,20,000\)
Step 2: Find average trade receivables.
Closing = ₹1,00,000,
Opening = ₹1,00,000 - ₹40,000 = ₹60,000
\[
\text{Average Trade Receivables} = \frac{1,00,000 + 60,000}{2} = ₹80,000
\]
Step 3: Apply the formula.
\[
\text{Trade Receivables Turnover Ratio} = \frac{\text{Credit Revenue}}{\text{Average Trade Receivables}} = \frac{3,20,000}{80,000} = 4 \text{ times}
\]