Question

please answer my question

Answer 1

HELLO FRIEND HERE IS YOUR ANSWER,,,,,,,,



Refer and consult the filling attachments for detailed explanation and step by step solution to conclude the final statement and the answer which is ,,,,,


ANSWER,,,,,


$\boxed{\huge{\textbf{OPTION \: D) \: 10}}}$ %


HOPE IT HELPS YOU AND CLEARS ALL YOUR DOUBTS FOR FINDING THE RATE BY USING A UNKNOWN VARIABLE!!!!!!