From the molarities volumes of reagents and the total

Question

Experiment steps:

1. Boil 200ml water in a 400ml beaker

2. Add 5.0 ml 0.30M Pb(NO₃)₂ to a regular test tube

3. Add 0.30 M HCl in 1ml-increments to the test tube above

4. After 3 ml of HCl (3 times of 1 ml increment) were added, a white precipitate (PbCl₂) formed.

5. 7 ml of water were added to dissolve PbCl₂

Question: From the molarities, volumes of reagents, and the total volume of solution (after water was added to just completely dissolve the precipitate), determine the value of the K_sp for PbCl₂

Please show me step by step solution. Thank you for your help in advance.