Question

mrs bhatia invested 30000 in two accounts 5% and second at 8% the total interest on the investment was rs 2100 how much did she invest at each rate​

Answer 1

$\begin{array}{| c | c | c | c | c | c | }</p><p>\cline{1-7} & 0 & 30 & 45 & 60 & 90 \\</p><p>\cline{1-7} sin & 0 & 1/2 & 1/√2 & √3/2 & 1 \\</p><p>\cline{1-7} cos & 1 & √3/2 & 1/√2 & 1/2 & 0 \\</p><p>\cline{1-7} tan & 0 & 1/√3 & 1 & √3 & ∞ \\</p><p>\cline{1-7} cosec & ∞ & 2 & √2 & 2/√3 & 1 \\</p><p>\cline{1-7} sec & 1 & 2/√3 & √2 & 2 & ∞ \\</p><p>\cline{1-7} cot & ∞ & √3 & 1 & 1/√3 & 0 \\</p><p>\cline{1-7} </p><p>\end{array}$

Answer 2

Let x be invested in one at 5% then 30000-x is invested in 8%
Therefore
5/100 x+ 8/100 (30000-x)=2100
5x+ 240009-8x= 210000
-3x= -30000
X = 10000

So investment in 5%is₹10000
And in 8% is ₹ 20000