A number is first decreased by 15% and then increased by 20%. The number so obtained is 78 more than the original number. The original number is:

A number is first decreased by 15% and then increased by 20%. The number so obtained is 78 more than the original number. The original number is:
एक संख्या को पहले 15% घटाया जाता है और फिर 20% बढ़ाया जाता है। इस प्रकार संख्या, मूल संख्या से 78 अधिक है। मूल संख्या ज्ञात कीजिए।

3900 2600 4500 5200