Public int sumOfN $($int n$)$

$//$Precondition: n is $>0$

$\{$

$$ int total $=0$;

$$ for $($int temp $=1$; temp $<=$ n; temp$++)$

$$ total $=$ total $+$ temp;

$$ return total;

$\}$

The method sumOfN$$returns the sum of the integers between $1$ and n$.$

a$)$ What is its order of growth?

b$)$Create a new method that performs the same function with a lower order of growth. Write the order of growth of your new method.