Question

explain why only sunday is choosen for holiday why not monday Tuesday Wednesday Thursday Friday and Saturday

Answer 1

From your question, it is assumed that, for workweeks in which an employee takes a paid day off or in which a paid holiday falls, you pay that employee at the regular rate of pay for the paid day off (or for the holiday), plus straight pay for the 40 hours worked, plus 10 hours at time and a half--in total, paying 50 hours at straight time, plus 10 hours at time and a half. Assuming these facts are true, and assuming you have no separate contractual agreement with your employees that provides otherwise, the short answer to your question is yes, this is legal.

Answer 2

Britishers are the first who started Sunday on the holidays.