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We were told that the rent is $750. If he pays the rent late by a week, the additional amount he pays is 4% of the rent. Recall, percentage is expressed in terms of 100. This means that the additional amount that he pays per week is
4/100 * 750 = 30
This means that for t weeks, the additional amount that he would pay is
30 * t = 30t
Thus, the cost function that gives the total cost R(t), in ebuka's rent if he pays with t weeks delayed is
R(t)= 750 + 30t