Table 8.6 shown below gives the percent of rats surviving, P, as a function of time, t, in months and concentration of formaldehyde, c, in ppm, so P = f(t, c). Use partial derivatives to estimate the percent surviving after 26 months when the concentration is 15. 

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Table 8.6 Percent, P, of rat population surviving after exposure to formaldehyde vapor Timer (months) 10 12 100 100 98 99 0 2 6 15 0 100 100 100 100 2 4 100 100 100 100 100 6 100 100 99 99 8 100 100 99 99 14 100 100 100 100 96 96 99 96 16 100 99 95 93 18 100 98 93 82 88588 20 22 99 97 70 97 95 58 24 95 92 80 36