The older brother will be able to spend an amount of GH¢64,932.21 each year for 25 years after retirement.
Future Value (FV) = P * ((1 + r)^n - 1/r)
FV = GH¢7,000 * (1+0.075)^{30} - 1/0.075]
FV = GH¢7,000 x (8.754955-1)/0.075
FV = GH¢7,000 x (7.754955/0.075)
FV = GH¢723,795.82
The amount of cash flow is derived and shows the current yearly savings will be available for him at the age of 65 and to be spent for the 25 years if he expects to live after retirement.
To determine the amount he is able to spend each year, we will copute that as follows:
GH¢723,795.82 = P * [1-(1+0.075)^{-25}/0.075]
GH¢723,795.82 = P * [(1-0.163979)/0.075]
GH¢723,795.82 = P * (0,836021 /0.075)
GH¢723,795.82 = P * 11.14695
P = GH¢723,795.82/11.14695
P = GH¢64,931.21
Therefore, the amount of GH¢64,932.21 will be spent each year for 25 years after retirement.
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