Question

6) Kalpesh calls his friends from outer country's very often. His friends are from different country and those country has different calling rates per min. Using following data find the rate per min for each country. Canada (Min) 90 U.S. (Min) 120 Brazil Min) 180 Total Charge 252 Month September October November 70 120 110 150 206 50 20 (Use both Cramer's rule and Matrix inversion method to solve problem and tally the answers​

Answer 1

Answer:

150  min

Explanation: