A hall 36m long and 15m broad is to be paved with stones, each measuring 8dm by 5 dm. The number of stones required is:  Choices:
A) 180 B) 1800 C) 18 D) 18000 E) 1350

Rationale: "area of the hall = 3600 * 1500 area of each stone = ( 80 * 50 ) therefore , number of stones = ( 3600 * 1500 / 80 * 50 ) = 1350 answer : e"
Answer: E