Question 789065
14% means 14 out of 100, or the fraction {{{14/100=0.14}}}.
To calculate 14% of an amount, multiply by {{{0.14}}} (It's {{{14/100}}} after all).
To increase an amount by 14%, multiply by {{{1.14}}} (It's {{{(1+0.14)}}} times, one time the amount, plus the {{{0.14}}} times that indicates the 14% increase).
To decrease an amount by 14%, multiply by {{{0.86}}} (because you want one time the amount minus the 0.14 times the amount that indicates the 14% decrease, and {{{1-0.14=0.86}}})
£{{{13}}} increased by 10% is £{{{13*1.10}}}= £{{{14.30}}}
£{{{900}}} increased by 47% is £{{{900*1.47}}}= £{{{1323}}}
£{{{99}}} decreased by 30% is £{{{99*0.70}}}= £{{{69.30}}}
£{{{350}}} decreased by 25% is £{{{350*0.75}}}= £{{{262.50}}}