addition in codeigniter project,

hi we have a school mgt system build with codeigniter, we want some additions n modifications in it. we have a bunch of changes, but for now, we want few additions in it so that we can have a permanent selected candidate for this in future also. price n time really matters. current system: i will send access only to non-generic bids and to individual freelancers only, not agencies. additions: 1) Payment types: these will b some values which will make a fee deposit slip of a student. like adminssion fees, anuual fees, tution fees etc etc. with options for making it recurring or one-time. 2) these payment types will b dif dif for each class, so where we add class in admin, there needs to be these options 3) there will b some discount pattern, also, dif with each student. 4) there will b one recurring payment (like tution fees) which will b auto debited in a student account on first date of each month. 5) Penality of late fees after every 10 of each month, if the fees is not paid, this will also be charged as recurring or one time 6) Accounts Reports: in which there will b 3 sub parts- (a) Each day Total fee collection. (b) paid and unpaid list of students (c) specific student details within a selected time frame, of what he was debited n what he was credited of, in his/her fin accounts. ------------------------------------- beyond these changes, i must tell u that system is already running with very good db structure and u can get most of the profile fields from there in, so just need to create something for accounting purpose. budget for this much of work is not more than 100usd, so plz bid accordingly. if u have skills n good price, no issues in hiring new freelancers.