Approximate solutions with explicit Euler steps
Use explicit (forward) Euler updates x[n+1]=x[n]+h and y[n+1]=y[n]+h f(x[n],y[n]). Evaluate each slope at the old point. Give exact values; do not round intermediate values
\[P'=1P\left(1-\frac P{40}\right),\quad t_0=0,\ P_0=30,\ h=\frac{1}{5}\]
P is in thousands of cells and t in days. Compute the next two population approximations; use each new approximate population in the next old-point slope