Compute all parts of given problem:

Problem: If forces of magnitude 4.00 N applied to each end of a spring cause the spring to stretch 3.80 cm from its relaxed length,

Part A: How far do the forces of magnitude 5.50 N cause the same spring to stretch?

Part B: How much work is done by the applied forces in stretching the spring 3.80 cm from its relaxed length?

I need help to find how much work is done by the applied forces in stretching the spring.