Please let me know what are the formulas

A news dealer receives 100 newspapers everyday, the daily demand is subject to day type (good, fair, poor). The distribution of newspaper demand and day type is given in the table below. Poor Table 1 Demand Probabilities Demand Good Fair 40 0.030 0.100 50 0.050 0.180 60 0.150 0.400 70 0.200 0.200 80 0.350 0.080 90 0.150 0.040 100 0.070 0.000 Table 2 Distribution of type of Newsday Type Probability Good 0.35 Fair 0.45 Poor 0.2 0.440 0.220 0.160 0.120 0.060 0.000 0.000 1. Generate news day type for 100 days. 2. For each day, generate a daily demand. Day type Demand