Evaluate 7/8xc for c=8
1 answer:
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Answer:
The percentage increase in the amount in her savings is 17.9%
Step-by-step explanation:
The formula for percentage increase is given as,
In previous month, amount of saving in Sally’s account was $200.
In the current month she added $35 and earned an interest of $0.75. So the total earning in current month will be,
Total earning = Amount in previous month + Amount added + Interest earned
Total earning = $ 200 + $ 35 + $ 0.75
Total earning = $235.75
So, current month amount of saving in account is $ 235.75 which becomes new value and previous month balance that is $ 200 becomes old amount.
Therefore, New value = $ 235.75 and Old value = $ 200
Substituting the values in the formula,
Rounding to nearest tenth means one digit after the decimal place. So, percentage increase is 17.9 %
Answer:
An old bone contains 80% of its original carbon-14 in 1844.6479 years
Step-by-step explanation:
We know that
half life time of C-14 is 5730 years
so, h=5730
now, we can use formula
we can plug back h
and we get
An old bone contains 80% of its original carbon-14
so,
P(t)=0.80Po
we can plug it and then we solve for t
So,
An old bone contains 80% of its original carbon-14 in 1844.6479 years