The marked price of a book was 30% less than the suggested retail price.  Alice purchased the book for half the marked price at a Fiftieth Anniversary sale.  What percent of the suggested retail price did Alice pay?
$\mathrm{(A)\ }25\%\qquad\mathrm{(B)\ }30\%\qquad\mathrm{(C)\ }35\%\qquad\mathrm{(D)\ }60\%\qquad\mathrm{(E)\ }65\%$
Without loss of generality, let's assume that the retail price was $100$ USD.
The marked price of the book is $30 \%$ off of $100$ which is equal to $100-100(0.3)=70.$
Half of that marked price is $0.5(70)=35.$
Therefore the percent Alice payed of the suggested retail price is $35/100=\boxed{\mathrm{(C) } 35 \%}.$