Sally went souvenir crazy on her trip to Mexico. She not only wasted good money on a sombrero
that had blinking lights on it, she also agreed to
pay a special 20% export tax. If Sally paid
$9.60 in tax, how much must the sombrero
have cost?

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality