MathematicsVariationJAMB
The cost C of printing n copies is partly constant and partly varies as n. C = ₦500 when n = 10 and C = ₦800 when n = 20. Find C when n = 30.
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Answer: A. ₦1,100
C = a + bn: 10b = 300 gives b = 30 and a = 200; C = 200 + 30 × 30 = ₦1,100.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.