
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
October 3rd, 2017, 10:08 PM  #1 
Newbie Joined: Feb 2017 From: yelm Posts: 4 Thanks: 0  Need a little help
Looking for help on a problem similar to this one. Please can u post step by step process Taylor has just invested in a stock worth \$430 that is expected to increase in value by 8% per year. This means that the amount his stock is worth (A) can be calculated by A=430⋅1.08t, where t is the number of years since the money was put in. How many years will it take for the value of his stock be \$1714? Round your answer to two decimal places. Last edited by greg1313; October 4th, 2017 at 03:28 AM. 
October 4th, 2017, 04:19 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,245 Thanks: 1439 
Did you mean A = \$430·1.08$^t$? If so, 1714/430 = 1.08$^t$. Hence $\log(1714/430) = t\cdot\log(1.08)$, and so $t = \log(1714/430)/\log(1.08) = 17.97$ to 2 decimal places. 

Thread Tools  
Display Modes  
