75% of a ship’s cargo was destroyed by an on-board fire. The captain of the ship sold the remaining

75% of a ship’s cargo was destroyed by an on-board fire. The captain of the ship sold the remaining cargo, which was slightly damaged, for 25% of its real value and received $1400. What was the value of the cargo before the fire? (Do not include the $ sign or commas in the answer)

So 25% of the cargo is left.
This was sold at 25% of value.

Let the starting value be s:
We have 0.25 * 0.25 * s = 1400
0.0625s = 1400

To solve for s, we type this equation into our search engine and we get:
s = 22400