Part 1: (SIMPLE) Write the necessary PHP code to calculate the total salary according to the following| equation: Total Salary Basic Salary + Martial Status Allowance + Extra Tasks Allowance if Any Examine the following HTML code that describes how the form will submit the required input data. Note the following requirements and details: BD 50 is paid as an allowance for single status employee and BD 100 is paid for married Assume the number of extra tasks are unknown. Extra allowances are part of checkboxes values. The form is submitted to the same program. The output should follow the sample screen shown below using ordered and unordered lists. Your program shouldn't display extras in case the user didn't choose any of the extra tasks options.

Basic Salary
Marital Status:
Single
Married
Extra:
Work on Weekend - BD 200
Work Night Shift - BD 100
Work Abroad - BD 400