Question

the present height of a tree is 847cm find its height two years ago if it increases at 10% per annum​

Answer 1

Two years ago tree's height 700 cm

Step-by-step explanation:

Let, height of the tree 2 years ago was $x$

For 2 years increment $= a + b +\frac{a \times b}{100}$

For 2 years increment in height $= 10 + 10 +\frac{10 \times 10}{100}$

2 years increments in height$= 21$

Total increment $= x +\frac{21}{100}\times x = \frac{121}{100}$

Increment in height $= \frac{121}{100}\times x = 847$

2 years ago tree's height, $x = 700$cm