A man's basic pay for a 40 hour week is Rs.20. Overtime is paid for at 25% above the basic rate. In a certain week he worked overtime and his total wage was Rs.25. He therefore worked for a total of :  Choose the correct answer.
A) 45 hours B) 47 hours C) 48 hours D) 50 hours E) None
Explanation:   Basic rate per hour = Rs.(20/40)= Rs.1/2   Overtime per hour = 125% of Rs.1/2=125/100×1/2=Rs.5/8   Suppose he worked x hours overtime.   Then,20+5/8x=25 or 5/8x=5   x=5×8/5=8 hours   So he worked in all for (40+8)= 
<gadget id="calculator">(40+8)</gadget>
<output>48</output>
48 hours.   48 hoursorrect Option: 48 hours
<result>C</result>
A man's basic pay for a 40 hour week is Rs.20. Overtime is paid for at 25% above the basic rate. In a certain week he worked overtime and his total wage was Rs.25. He therefore worked for a total of :