Seema purchased a car for $₹2,25,400$ and spent $₹10,000$ on its repair. Then she sold it for $₹2,25,000$. Find her profit or loss per cent.

If the simple interest for the following is $₹k$, then find the value of $k:$

$P=₹7200$, $R=7.5\%$ per annum, $T=6$ months

If the simple interest for the following is $₹k$, then find the value of $k$:

$P=₹9000$, $R=8\%$ per annum, $T=2$ years $6$ months

If the rate of interest for the following is $k\%$ (in decimal), then find the value of $k$:

$P=₹5200$, $SI=₹975$, $T=2$ Year $6$ months