Question

Solve the following word problem by using Table 11-1.

The rate of bacteria growth in a laboratory experiment was measured at 17% per hour. If this experiment is repeated and begins with 5 grams of bacteria, how much bacteria should be expected after 12 hours? Round to the nearest tenth of a gram.

Click here for Table 11-1

Do not enter units in your answer.

grams

Solve the following word problem by using Table 11-2.

Pinnacle Homes, a real estate development company, is planning to build five homes, each costing $145,000, in 3 years. The Galaxy Bank pays 8% interest compounded semiannually. How much should the company invest now to have sufficient funds to build the homes in the future? Round your answer to the nearest cent.

Click here for Table 11-2

$

Miguel wants to have $17,000 in 10 years. Use the present value formula to calculate how much Miguel should invest now at 8% interest, compounded semiannually in order to achieve his goal.

Periods 1% 1 2 % 3% 78% Periods 1.005OD 1.01003 1.OISON 1.02015 1.02525 1.01000 1.02010 1.03030 1.04060 1.05101 1.01500 1.0300.97052 0.96569 0.96089 0.95610 0.95135 0.94205 0.93272 0.92348 0.91434 0.90529 0.91454 0.90103 085771 087459 086167 085797 0

0 0
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Answer #1

1. Given,

Beginning measure: 5 grams, Rate of growth per period (hour)=17% and time horizon=12 hours.

Future Value Factor for 12 periods at 17%= 6.58007

Weight of bacteria expected after 12 hours= Beginning value*Future Value Factor= 5*6.58007 = 32.9

2. Given,

Cost of each home= $145,000. Therefore, total amount required for 5 homes (A) = $145,000*5= $725,000

Time horizon: 3 years, compounded semiannually. Therefore, number of compounding periods (n)= 3*2 = 6

Rate of interest per year= 8%. Therefore, rate per period (r)= 8%/2 = 4%

Present Value Factor (PVF) for 6 periods @4% interest= 0.79031

Amount to be invested now is the present value (PV) of future sum required, computed as follows:

PV= F* Present Value Factor

Substituting the given values, amount to be invested now= $725,000*0.79031 = $572,974.75

3. Present Value is calculated using the following formula:

PV= FV/(1+r)^n Where PV= Present Value, FV= Future Value, r= Rate of interest per period and n= number of times compounded.

Given,

Future Value required (FV)= $17,000

Period= 10 Years. Compounding frequency= Semi annual. Hence number of times compounded a year=2 and total number times of compounding (n) =10*2 = 20

Rate of interest=8%. Therefore, rate of interest per compounding period (r)= 8%/2 =4% or, 0.04

Substituting these values in the formula,

Amount to be invested now (PV)= $17,000/(1+0.04)^20 = $17,000/2.191123= $7,758.58

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