Answer
$9,333,333$
Work Step by Step
The total spending can be represented by the sum of the infinite geometric series with first term $a_1=4,000,000\cdot0.7=2800000$ and common ratio $r=0.7$. An infinite geometric series converges if and only if $|r|\lt1$, where $r$ is the common ratio. If it converges, then it equals $\frac{a_1}{1-r}$ where $a_1$ is the first term.
Here $0.7\lt1$.
Hence the sum: $\dfrac{2800000}{1-0.7}=9,333,333$