Approximately 14.77 kilograms of tea were sold.
Let's denote the cost price per kilogram of tea as C) and the quantity of tea sold as Q.
We know that the total gain (G) is given by the formula:
G = Profit Percentage * Cost Price
Substitute the given values:
90 = 0.20 * 30.48 * Q
Now, solve for Q:
Q =
Q

Q

So, approximately 14.77 kilograms of tea were sold.