Please solve both for second question 1.8*10^-7 is wrong answer so please solve it correctly

The molar solubility of PbCl2 in 0.10 M NaCl is 17 x 10.2 moles in a liter (that is 17x 10 moles of PbCl, will dissolve in 1 liter of the solution). What is the Ksp of PbCl2? What is the maximum concentration of Cl that would precipitate only one of the ions in a solution that is 0.0010 M in Ag and 0.020 M in Pb2+2 Ksp(AgCl) = 1.810-10. Ksp(PbC1)=17x10-5 M The maximum [C1) is just below 18e-7