0
250(x) = 400,000
Use logs to base '10'
Hence
log250^(x) = log400,000
xlog250 = log 400,000
Notirce how the power (x) becomes the coefficient. This is oerfectly correct under 'log' rules.
x = log 400,000 / log 250 (NOT log(250/400,000).
x = 5.60206 / 2.39794
x = 2.33619689..... ~ 2.33619 to 5 d.p.
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