Aworker received a $10,000 bonus and decided to split it among three different accounts. he placed part in a savings account paying 4.5% per year, twice as much in government bonds paying 5%, and the rest in a mutual fund that returned 4%. his income from these investments after one year was $455. how much did the worker place in the government bonds?

so savings = $2200

bonds = $4400

and mutual fund = $3400

Explanation:

given data

received bonus = $10,000

savings account paying = 4.5% per year

bonds paying = 5%

mutual fund that returned = 4%

income from these investments = $455

to find out

How much did the worker place in the government bonds

solution

we consider amount invested for 4.5 % is = x

and hen his investment in bonds is = 2x  for 5%

and rest is  10000- x  - 2x

that is = (10000- 3x ) for 4%

so

interest equation will be here

0.045 x + 0.05 (2x) + 0.04 (10000-3x) = 455

solve we get

x = 2200

so savings = $2200

bonds = $4400

and mutual fund = $3400

what are the options

explanation:

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'