please show work

If you save for retirement every other week, (you get paid biweekly and have it automatically withdrawn from your paycheck), what's your ending balance if you contribute $50 per paycheck for the first 5 years, then $75 per paycheck for the next 10 years, then $120 per paycheck for 15 more years? Use an investment return of 7.5% APR. Edit View Insert Format Tools Table 12ptParagraph BI U ALT? OD