# What kind of technique is to be adopted if I have to find an equation or model for say, D depends on C, C changes for a set of B, which changes for different A.

What kind of technique is to be adopted if I have to find an equation or model for say, $D$ depends on $C$, $C$ changes for a set of $B$, which changes for different $A$.
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hitturn35
Let money invested at 3% =x
at $4\mathrm{%}=50000-x$
Time for both = 1 year
$SI=\frac{P×T×R}{100}\phantom{\rule{0ex}{0ex}}\left(SI{\right)}_{3\mathrm{%}}-\left(SI{\right)}_{4\mathrm{%}}=30\phantom{\rule{0ex}{0ex}}\therefore \frac{x×1×3}{100}-\frac{\left(5000-x\right)×1×4}{100}=30\phantom{\rule{0ex}{0ex}}3x-4\left(50000-x\right)=3000\phantom{\rule{0ex}{0ex}}3x-200000+4x=3000\phantom{\rule{0ex}{0ex}}7x=203000\phantom{\rule{0ex}{0ex}}x=29000$
Money at 3% = $29000 4%=$21000