A school orders 120 calculators. The school receives a shipment containing 80% of the order, and 1 out of every 3 of these calculators is black. How many black calculators has the school received in this shipment? a) 32 b) 40 c) 50 d) 96

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