19.In the figure given, we have a regular pentagon at the centre of the given pentagonal star. But the outer triangles of the star are shown as equilateral. But or can see from the triangle given below, that it cannot be so. Hence the data given is not consistent.

25.Percentage decrease in the purchase price of DVD player = = 25%

Average rate of decrease = = 6.25%

This answer is not available in the given choice.