exam Maths Puzzle Numerical Ability Number System

How do I solve?: 4p+2c=80

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A recently retired man requires $6,000 per year in extra income. He has $50,000 to invest. He can invest in B-rated bonds paying 15% per year or in a certificate of deposit (CD) pa If the circle with centre(0,m) has equation x^2+y^2+6y+5=0, what is the value of m?