Aisha travels from Johannesburg to New York. She converts 8200 South African Rand (ZAR) into US Dollars (USD). The exchange rate is 1 ZAR = 0.0512 USD. The exchange bureau deducts a 2.5% commission from the USD amount obtained. Before returning home, Aisha has 75 USD remaining and converts this amount back into ZAR. The exchange rate is 1 ZAR = 0.0480 USD, and the bureau takes a commission of $p$% of the ZAR amount obtained. The commission fee for this exchange is 31.25 ZAR.

The speed $v(t)$ (in $\mathrm{m}{\mathrm{s}}^{-1}$) of a skydiver $t$ seconds after a parachute opens is modelled by $\frac{dv}{dt}=0.6(12-v)$, $v(0)=30$.

Let $S=\left(a{\sin }^2(4b)\right){\left(c^2{\tan }^2(12d)\right)}^{-1}(\sqrt{a}+c-\cos (48b))$, where $a=16,b=7.5^{\circ },c=3,d=5^{\circ }$.

Noah traveled from Switzerland to the United Kingdom and converted 1250 Swiss francs (CHF) into pounds sterling (GBP). The conversion rate was 1 CHF = 0.88 GBP. Returning home, Noah had 420 GBP left to convert back into CHF. A service fee of 6% was applied to this conversion.

Daniel exchanged 760 euros (EUR) into Swiss francs (CHF) for a trip to Switzerland. The exchange rate was 1 EUR = 0.96 CHF. When he returned home, Daniel exchanged his remaining 420 CHF back into euros. The bank charged a 3 % commission on this transaction.