Need help please I'm using Xcode for mac

Exercise 3-1: write the "PrintTax" program that reads in an income value and print out its corresponding tax amount of 25% as the currency (exactly 2 decimal places with a prefix "$" sign) Sample Output C:>PrintTax Please enter income: 100 Income: $100.00 Tax: $25.00 C:>PrintTax Please enter income: 100.25 Income: $100.25 Tax: $25.06 C:>PrintTax Please enter income: 50.7 Income: $50.70 Tax: 12.68