please help me to solve this C programming problem.

4. Write calls for printf that display a float variable x in the following formats. (a) Exponential notation; left-justified in a field of size 8; one digit after the decimal (b) Exponential notation; right-justified in a field of size 10; six digits after the (c) Fixed decimal notation; left-justified in a field of size 8; three digits after the (d)Fixed decimal notation; right-justified in a field of size 6, no digits after the point decimal point decimal point. decimal point. 5. Write a program that asks the user to enter a dollar-and-cents amount, then displays the amount with 5% tax added Enter an amount: 100.00 With tax added: $105.00