Question

Paul started a construction company. In the first year, his company built 6 structures. The number of structures that his company built doubled every year.
How many total structures did Paul's company build by the end of the 5th year?


A.) 96
B.) 90
C.) 186
D.) 378

Answer 1

For this case we have an equation of the form:
 y = A (b) ^ x
 Where,
 A: initial amount
 b: growth rate
 x: time
 Substituting we have:
 y = 6 * (2) ^ (x-1)
 For year 5 we have:
 y = 6 * (2) ^ (5-1)
 y = 96
 Answer:
 by the end of the 5th year Paul's company build:
 A.) 96