solve that using algebra fromula please

Assume your initial salary is $48,000 and that you anticipate that your salary will grow at an average rate of 4% each year, and you will save 6% of your annual salary. You estimate that you will earn an 12% average annual rate of return over the next 30 years. All cash flows are annual. a What will be the balance in your retirement fund at the end of 30 years if all cash flows occur at the end of each year? b. What will be your balance if you save at the beginning of each year? c. What percentage of your salary must you save at the end of each month if you want to achieve a balance of S$1,250,000 at the end of 30 years