Q 20. वह धनराशि कितनी होगी, जो 5 प्रतिशत वार्षिक की दर पर, दूसरे वर्ष में 420रु. चक्रवृद्धि ब्याज प्राप्त कर सके?
1⃣ रु.4,000
2⃣ रु.42,000
3⃣ रु.8,000
4⃣ रु.21,000
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suppose p = x
then!= (x+420)
105. 105
then= x ------ ------- = x+420
100. 100
21. 21
then. x ------ ----- = x+420
20. 20
421
then = x ----- = x+420
400
421x
then = ------ = x+420
400
then 421x =400x + 168000
then= 421x-400x = 168000
then = 21x = 168000
x = 8000
then!= (x+420)
105. 105
then= x ------ ------- = x+420
100. 100
21. 21
then. x ------ ----- = x+420
20. 20
421
then = x ----- = x+420
400
421x
then = ------ = x+420
400
then 421x =400x + 168000
then= 421x-400x = 168000
then = 21x = 168000
x = 8000
anupsingh97:
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