Question

p=12000 simple interest =1890 n=2yrs 4 month r=?

Answer 1

$r = \frac{si \times 100}{pt} \\ r = \frac{1890 \times 100}{12000 \times \frac{7}{3} } \\ r = 6.75\%$
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Hope this will be helpful for you.

Answer 2

simply use the formula SI=PTR/100
you will get the following equation
1890=12000*7/3*R/100
you'll get the following equation
1890*3*100/12000*7=R
you'll get R=6.75%