Use Miner's rule to solve the following problem using the S$-$N curve given below. $($Hint: Use the equations given on the graph rather than trying to interpolate by hand$).$ What is the cumulative damage $($C$)$ if you apply $550$MPa for $75,000$ cycles and $450$MPa for $900,000$ cycles?

$C=0$

$C=0\mathrm{.}36$

$C=0\mathrm{.}59$

$C=0\mathrm{.}78$

$C=1$