Matlab please, thank you

Q3. Suppose an algorithm has O(2n) complexity, where n is the size of a problem which is solved using such an algorithm. Let n=50 for a given problem. Let's say a current computer takes 1 micro-second to perform each operation. What fraction of the problem can it solve in 1 second? What size problem can a computer which is half as fast (i.e., each operation takes twice the time as the current computer) solve in 1 second using the same algorithm? Q4. Suppose an algorithm has O(logn) complexity, where n is the size of a problem which is solved using such an algorithm. Let's say a current computer can solve the complete problem using the algorithm in 1 second. What size problem can a computer which is half as fast (i.e., each operation takes twice the time as the current computer) solve in 1 second using the same algorithm