You are working for FALCON highway construction agency as a project cost estimator. The agency started a highway construction project which is in it's planning phase. The rough order of magnitude (ROM) cost estimate for the project is expected to be between 3 and 5 million dollars in the planning phase with a ROM of -25% to +25%. What will be the ROM estimate in the execution phase if it changes to -10% to +10%?
A. Between 3.1 and 4.1 million dollars
B. Between 3.6 and 4.4 million dollars
C. Between 3.9 and 4.1 million dollars
D. Between 3.4 and 4.4 million dollars
can any one explain how ans B is the right choice?with deatiled explnation and calculation