Contemporary Mathematics for Business & Consumers 8th Edition by Robert Brechner,Geroge Bergeman

Exercise 3

Ransford Alda is a self-employed security consultant with estimated annual earnings of $90,000, His social security tax rate is 12.4%, Medicare is 2.9%, and his federal income tax rate is 14%.
a. How much estimated tax must Ransford send to the IRS each quarter
b. What form should he use