The perimeter of a triangle is 32 cm and the inradius of the triangle is 2.5 cm. What is the area of the triangle?
Choose the correct choice from the following answers:  A) 87 cm 2  B) 28 cm 2  C) 98 cm 2  D) 26 cm 2  E) 40 cm 2

Rationale: "area of a triangle = r * s where r is the inradius and s is the semi perimeter of the triangle . area of triangle = 2.5 * 32 / 2 = 40 cm 2 answer : e"
Answer: E