Student secures $90\%$, $60\%$ and $54\%$ marks in test papers with $100, 150$and $200$ respectively as maximum marks. The percentage of his aggregate is

Evaluate:

$60\%$of $75.$

Evaluate:

$42 \mathrm{is} 30\%$ of what number?

$\mathrm{C}.\mathrm{P}=$$₹720$, overheads$=₹80,$$\mathrm{S}.\mathrm{P}.=$$₹1000,$ gain$\%=$?

Evaluate:

Which is a better discount? 

$\mathrm{A}: 50\%$ discount on $₹306$ 

$\mathrm{B}: 35\%$ discount on $₹480$.

Evaluate:

You deposit $₹1200$ into your account on $8\%$ simple annual interest. The balance in your account after $3$ years is?