A machine, working at a constant rate, manufactures 72 staplers in 28 minutes. How many staplers does it make in 1 hr 52 min?	Choose the correct answer:
A) 268	B) 262	C) 300	D) 288	E) 250
Change 1 hr 52 min to 112 min. For this, we need to set up a simple proportion of staplers per time 72/28= S/112.   The absolutely worst thing you could do at this point in the problem is to cross-multiply. That would be a supremely unstrategic move. We can cancel the common factor of 28 in the two denominators.   72/28*28 = S/112*28   72/1 = S/4   S = 4* 72= 
<gadget id="calculator">4* 72</gadget>
<output>288</output>
288   The machine would be 288 staplers in 1 hr 52 min.   Answer:288
<result>D</result>
A machine, working at a constant rate, manufactures 72 staplers in 28 minutes. How many staplers does it make in 1 hr 52 min?