Please help in SAS

We have three data sets, ONE, TWO, and THREE. Each data set contains the variables: ID (IDNUM in data set TWO) SEX DOB SALARY In addition, data set TWO contains TAXRATE and WITHHOLD; data set THREE contains HEIGHT and WEIGHT a. Write a program to create a single SAS data set ALL which combines the observations from data sets ONE, TWO, and THREE and contains the variables ID, DOB, and SALARY. b. Write a program to create a new SAS data set for those people born on or before January 1, 1960, and who earn $50,000 or more per year. + ONE ID SEX DOB SALARY 01 M 10/21/46 70000 02 F 11/01/55 68000 07 M 01/27/59 47000 TWO IDNUM SEX DOB SALARY TAXRATE WITHHOLD 03 F 01/01/33 78000 0.36 23000 05 M 03/07/29 37000 0.25 9000 THREE ID SEX DOB SALARY HEIGHT WEIGHT 04 M 10/23/49 65000 68 158 06 F 07/04/65 55000 74 202