Answer:
22 years approx.
Step-by-step explanation:
Step one
Given data
Principal P= $850
final amount A= $1125
rate r= 12.6%
Calculate time, solve for t
t = ln(A/P) / r
Step two:
Substitute
t= ln (1125/850)/0.0126
t=ln 1.32/0.0126
t= 0.277/0.0126
t=21.9
t= 22 years approx.
Answer: 1) marks got by class 7 in PAT study
2) 22 and 25 respectively
3) three
4) Prachi
5) Steven
Multiplying 37.4 x 0.7 gives you answer less than 37.4 because....
There is one decimal point in 37.4 and one decimal point in 0.7
When multiplied you have to move the decimal point TWO times.
As you move the decimal point to the left the value decreses.
Hope I helped!
-Char