how would I perform this serial dilution?

For the calibration curve, pipet 500 UL of the stock and diluted solutions of bovine serum albumin in a clean test tube. Add 1.50 mL of 0.10M H;PO4 solution. Perform serial dilution to prepare 50oug/ml, 250pg/ml, 125pg/ml, 62.5pg/ml, and 31.3ug/ml BSA working solutions. The final volume of each BSA solution should be 1.oml