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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsExpert
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A machine costs (1000) rupees on the first day and (45) rupees less each next day. What is the total cost in (12) days?

Answer and explanation

Correct answer: (9030)

The costs form the decreasing AP (1000,955,910,\ldots) and (S_{12}=9030). Exam tip: take (d) negative for decreasing costs.

Related tags

ApWord-ProblemCostDecreasingWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics
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