Matrix competition group 10

3 teachers, mdm lo, mr sng and miss tan were in the moe website for the best teachers award they were judged as follows:
mdm lo has 300 votes for students 15 votes from staffs 300 votes from moe users and 30 votes from others respectively.
mr sng has 200 from students,25 from staffs,200 from moe and 20 from others respectively while
miss tan has 100 from students,10 from staffs,50 from moe users and 5 from others. The cost of votes is $0.30 per student,$0.20 per staff, $0.10 per moe user and $1.00 for others.
a)write down two matrices such as the to find the total cost of votes
b) the company made a mistake and increase the cost of votes increase by 10% the last minute,calculate the new matrix using a scalar.