If a sum amounts to ₹12,900 at the end of the 4th year and ₹14,250 at the end of the 5th year at simple interest, what is the rate of interest?

If a sum amounts to ₹12,900 at the end of the 4th year and ₹14,250 at the end of the 5th year at simple interest, what is the rate of interest?
यदि एक राशि साधारण ब्याज की एक निश्चित दर से चौथे वर्ष और पांचवें वर्ष के अंत में क्रमशः ₹12900 और ₹14250 हो जाती है, तो ब्याज की दर है:

10% 12% 18% 20%