Assume that P(x) signifies percentage of income spent on automobile insurance in year x and I(x) signifies income in year x. Find the function A which signifies total automobile insurance expenditures in year x.
i) A(x) = (P · I)(x)
ii) A(x)= (I/P)(x)
iii) A(x) = (I - P)(x)
iv) A(x) = (P + I)(x)