A builder must decide whether to rent or buy an excavating machine. If he were

to rent the machine, the rental fee would be RM3000 per month (on a yearly

basis), and the daily cost (gas, oil and driver) would be RM180 for each day the

machine is used. If he were to buy it, his fixed annual cost would be RM20,000,

and daily operating and maintenance costs would be RM230 for each day the

machine is used. What is the least number of days each year that the builder

would have to use the machine to justify renting it rather than buying it?