Increase £180 by 12.5%

£202.50

Step-by-step explanation:

First convert 12.5% into a decimal by dividing it by 100 to get 0.125.

Then we work out 12.5% of 180 by multiplying them: 180 * 0.125 = 22.5

Then we are increasing so add it back to the original: 180 + 22.5 = 202.5

Because we are using £ we add it back on and add a 0 for the pennies.

  about 5.6 days

step-by-step explanation:

we can fill the given information into the decay equation and solve for the value of t at which half the sample remains.

the half-life is about 5.6 days.