Question 1046845
Some at 5%, rest at 10%
Use .05  and .10 for the Arithmetic
Let x be the amount at 10%
.10x + .05(30000 - x) = 1950
.05x = 1950 - 1500
x = 450/.05
x = $9000, the amount at 10%.   {{{30000-9000}}} = $21,000 at 5%
CHECK...
$900 + $1050 = $1950