A courtyard is 25 meter long and 16 meter board is to be paved with bricks of dimensions 20 cm by 10 cm. The total number of bricks required is?
Choose the correct option
A) 22877
B) 27778
C) 20000
D) 27999
E) 17799

Rationale: "number of bricks = courtyard area / 1 brick area = ( 2500 × 1600 / 20 × 10 ) = 20000 answer : c"
Answer: C