I'm computer engineering TA - Experienced programming using Intel Fortran Compiler - integrating it with Microsoft Visual Studio 2015
I read the attached required description of the 3 required functions (prob1 ,3 and 5) I'm able to finish it perfectly within few hours.
Hey I wrote my whole PhD thesis in Fortran, this is simple stuff you need. I can fit into your budget of 40 USD and deliver the programs in two days max, probably before.