exam Maths Puzzle Numerical Ability

Find the determinant of matrix B if we know that matrix A det[a, b, c][d, e, f][g,h,i] = 5.

B = [a, b, c][a+2d, b+2e, c+2f][3a+g, 3b+h, 3c+i]

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average tuition in 1990 was $2035.00. By 2000 it had risen approx 85%. What was the approx. cost in 2000
Sorry, but I have one more question on the substitution method. It is a+b=5000 and 0.08a=0.06b-20 THANKS ALOT