looking to build 2x google sheet scripts with calculation formulas

Job ID: 36391033

Budget: €8 – €30 EUR

Looking to build a script which will allow to calculate

figure + 10% = +25 = +23% = rounded to 4.99 or 9.99

Script must have option to edit the precentage and the fixed digit
script must be user friendly and must have section to choose the column output
script must have the option to mark the cell range of which need to be change

attached please find the way i need the script to look
Related categories: PHP JavaScript Visual Basic Excel Software Architecture