Respuesta :

split the image into 2 rectangles
so
A = (8 x 4) +(10 x 7)
A = 32 + 70
A = 102 

answer
B. 
102 sq cm
7 x 10 = 70

4 x 8 = 32

32 + 70 = 102

102 is your answer. :-)