DBE/November 2021 NSC 4.2 Bobby got the idea of selling biryani from his niece Janet who has her own takeaway business in South Africa. Janet's variable cost to make one plate of chicken biryani is R13,00. Her fixed cost amounts to R600. [Adapted from www. quora. com) Use the information above to answer the questions that follow, 4.2.1 Janet uses the equation below to calculate her total cost: Total cost = R600,00 + 13 p, where p = number of plates. (4) Use the equation to determine the number of plates sold if the total cost was R1 380,00 4.2.2 TABLE 6 below shows Janet's total cost and income from selling different numbers of plates of biryani. TABLE 6: INCOME AND COST OF SELLING DIFFERENT NUMBERS OF PLATES OF BIRYANI NUMBER OF 0 10 30 50 70 90 100 PLATES INCOME (R) 0 250 750 1 250 1750 2 250 2 500 COST (R) 600 990 1250 1 510 1 770 1900 730 The income graph has already been drawn on the attached ANSWER SHEET. (3) Use TABLE 6 and the same grid on the ANSWER SHEET to draw another line graph representing the cost of different numbers of plates of biryani. (2) 4.2.3 Determine the minimum number of plates of biryani that Janet must sell before she starts making a profit.