1. Company's formula (Basic/26/8hrs) x 2 times x 2 hrs is correct.
2. Go according to the following section of the Employment Act
"60(3) (b) In the case of an employee employed on a monthly rate of pay who works on a rest day, he shall be paid for any period of work:
(i) which does not exceed half his normal hours of work, wages equivalent to half the ordinary rate of pay for work done on that day; or
(ii) which is more than half but which does not exceed his normal hours of work, one day's wages at the ordinary rate of pay for work done on that day. "
That means working less than 4 hours, you pay half day salary at ORP, more than 4 hours one day.