A full adder is implemented using XOR ,AND,OR gates.the propagation delay of AND and OR gates are half of XOR gates .and propagation delay of XOR gate is 2 ms.a 4 bit ripple carry adder is implemented using 4 full adders . The total propagation delay of 4 bit ripple carry adder will be____?

Note:the input given to gates is not restricted to 2.the gates have fan-in more than 2.