Please provide a detailed solution for the following

Calcium in powdered milk was determined by ashing (burning) a 1.650g sample, dissolving the burned sample in 100.0m,HCl, adjusting the pH to 9.0 and then titrating with EDTA solution which required 13.28mL at the Eriochrome Black I end point. The EDTA solution was standardized by titrating 10.00mL of a Zn2+ solution, prepared by dissolving 0.595gZn metal (molar mass =65.39g/mole ) in an acid and diluted to 1000.0mL, requiring 10.45mL of EDTA. Calculate the calcium concentration in the powdered milk in parts per million (ppm) using the Molar mass of CaCO3(100.1g/mole)