Marcel has a $1$:$22$ scale toy helicopter that has a height of $27\mathrm{.}4cm,$ and a length of $8\mathrm{.}2cm.$ Determine the height of the real helicopter $($round to the nearest $cm).$

A computer chip on a circuit board is a rectangle. The width is $5mm.$ The length is $10mm.$ James is using a scale of $8$:$1$ to draw plans for the circuit board. What is the width of the drawing?

$$7000$ was invested for $8$ years at a guaranteed interest rate of $7\frac{\%}{y}r.$ Using the simple interest formula, determine the amount of interest earned. $)=(Prt$

Jordan decided to invest $$8000$ into a savings account that will earn $4\mathrm{.}5\frac{\%}{y}r,$ compounded annually. Using the compound interest formula: $A=P(1+\frac{r}{n}{)}^{nt},$ determine how much she will have in the savings account after $3$ years?