Calculator, Boolean Data, Simple Interest & Marks Calculation Guide

.Write a program to provide simple calculator that will   Perform (a) addition, (b) subtraction, (c) multiplication and (d) division of given  two numbers.  

Write a program to provide brief inf ormation on boolean  data type.  

Write a program to calculate Simple Interest.   Formula: (Principal Amount rate inter est time period)/100.    

Write a program to find total and percentage marks all subjects (subjects need to be input by user). Hint – M ake use of for loop to input number of subject.