Ruby / Rails calculation -

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i have rails 3 application , following problem. need calculate price based on following:

  • term range 1 365 days (1 year).
  • tariffs in tables presented in 2 sections: 1 day , half month (15 days)

example 1:

  • prices: 1 day price = 0.5 , 15 days = 6
  • term : 45 days.
  • price: price devide number of days 15 (45/15 = 3) , multiply result tariff 15 days (3*6 = 18). final price 18.

example 2:

  • prices: 1 day price = 0.5 , 15 days = 6
  • term : 79 days.
  • price: price find half month period in case 45 , again devide number 15 (75/15 = 5) , multiply result tariff 15 days (5*6 = 30). there 4 more days account for, multiple them price day (4*0.5 = 2). sum of 2 results forms final price (30+2 = 32).

the period submited through , can 1 day 365 days, prices per day , 15 days stored in database. question how make calculations in ruby/rails, code calculates half month , reminder if any? appreciated.

use modulo operator:

79 / 15 # dividing integers performs euclidian division => 5  79 % 15 # gives rest euclidian division.  => 4

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