Home›MPPSC Forest›State Forest Service Mains Exam›Section 'B': Forestry and General Science›UNIT-10: Elementary Mathematics and General Mental Ability›Average, profit and loss, simple and compound interest›A certain amount becomes two times with simple interest in a certain

A certain amount becomes two times with simple interest in a certain time (T years) at a certain rate of interest (R%) per annum. Then which of the following is not correct about rate and time?

20213M#mppsc-forest#pyq#mcq#2021
A.R = 10%, T = 10 years
B.R = 15%, T = 7 yearsCorrect
C.R = 25%, T = 4 years
D.R = 5%, T = 20 years
Explanation & Solution

Correct Answer: (B) R = 15%, T = 7 years

For a sum to become double with simple interest, the formula is R x T = 100. Checking the options: 10 x 10 = 100, 25 x 4 = 100, 5 x 20 = 100. However, for option B, 15 x 7 = 105, which does not equal 100, making it incorrect.

हिंदी में प्रश्न एवं आदर्श उत्तर

एक निश्चित राशि, निश्चित समय (T वर्ष) में निश्चित वार्षिक दर (R%) पर साधारण ब्याज के साथ दोगुना हो जाती है। तब निम्नलिखित में से दर और समय के संबंध में कौन-सा सही नहीं है?

A.R = 10%, T = 10 वर्ष
B.R = 15%, T = 7 वर्षसही
C.R = 25%, T = 4 वर्ष
D.R = 5%, T = 20 वर्ष

सही उत्तर: (B) R = 15%, T = 7 वर्ष

साधारण ब्याज के साथ किसी राशि के दोगुना होने के लिए सूत्र R x T = 100 होता है। विकल्पों की जांच करने पर: 10 x 10 = 100, 25 x 4 = 100, 5 x 20 = 100। हालांकि विकल्प B के लिए, 15 x 7 = 105 होता है जो 100 के बराबर नहीं है, अतः यह संबंध सही नहीं है।

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