Multiply the first equation by 2: $ 10p + 4s = 97.00 $. Subtract the second equation: $ (10p + 4s) - (3p + 4s) = 97.00 - 51.00 $, yielding $ 7p = 46.00 $. Thus, $ p = \frac467 \approx 6.57 $. Substitute into the first equation: $ 5(6.57) + 2s = 48.50 \Rightarrow 32.85 + 2s = 48.50 \Rightarrow 2s = 15.65 \Rightarrow s = 7.825 $. The value of a stone tool is $ \boxed7.83 $ dollars. - Groen Casting