A1. Ella scores $60 \%$ on a test of 25 questions, $70 \%$ on a test of 30 questions, and $80 \%$ on a test of 45 questions. If the tests are combined into one test with 100 questions, what is her score for that test of 100 questions?
(A) $68 \%$
(B) $70 \%$
(C) $72 \%$
(D) $74 \%$
(E) $76 \%$
A1. Ella scores $60 \%$ on a test of 25 questions, $70 \%$ on a test of 30 questions, and $80 \%$ on a test of 45 questions. If the tests are combined into one test with 100 questions, what is her score for that test of 100 questions? (C) $72 \%$

Solution $60 \%$ of 25 is $15 ; 70 \%$ of 30 is 21 ; and $80 \%$ of 45 is 36 . She thus had a total of $15+21+36=72$ questions correct out of the 100 .