Auto sum 2 adjacent row data into 3rd row?



I have a list of people's names in column C and cost data for each person in
column M and N.

Is there was to provide a subtotal of all cost data for each person in
Column O?


row 1 Smith, John 100.00 440.00
row 2 Smith, John 300.00
row 3 Smith, John 40.00
row 4 Bird, Joe 50.00 500.00
row 5 Bird, Joe 450.00

Thank you in advance! :)


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