(7.5 × 7.5 + 37.5 + 2.5 × 2.5) is equal to :	Answers.
A) 30	B) 60	C) 80	D) 100	E) none of these

Rationale: solution given expression = ( 7.5 × 7.5 + 2 × 7.5 × 2.5 + 2.5 × 2.5 ) = ( a 2 + 2 ab + b 2 ) = ( a + b ) 2 = ( 7.5 + 2.5 ) 2 = 102 = 100 . answer d
Answer: D