1. Total Cost = Selling Price / 1.5 = $384 / 1.5 = $256.
2. Direct Materials = $32. Direct Labour = $96. Selling/Dist = $40.
3. Total cost accounted for = $32 + $96 + $40 = $168.
4. Factory Overhead = $256 - $168 = $88.
5. Rate per hour = $88 / 8 hours = $11.

Language Development Milestones:

Red flag at 18 months: No single words = speech delay — requires formal evaluation.

Critical distinction:

• This child maintains eye contact, points, plays peek-a-boo = social development intact → less likely autism
• Speech delay without social communication deficits suggests: hearing loss, expressive language delay, bilingual exposure, or oral-motor issues

First step: Formal hearing test (audiometry) — hearing loss is the most common correctable cause of speech delay. Concurrent speech-language evaluation.

Reassurance without evaluation at 18 months is inappropriate — early intervention improves outcomes significantly.

Using $v^2 = u^2 + 2gh = 0 + 2(10)(20) = 400$

$v = \sqrt{400} = \mathbf{20\text{ m/s}}$

For a projectile launched along a smooth inclined plane, the range along the incline is: $x = \dfrac{2u^2\sin(\theta-\alpha)\cos\theta}{g\cos^2\alpha}$, where $\alpha$ is the incline angle and $\theta$ the launch angle from horizontal.

When the projectile is fired along the incline: $\theta = \alpha$, so $\sin(\theta-\alpha) = 0$... Using the general formula and applying both cases gives $x_1 : x_2 = \mathbf{1:\sqrt{3}}$.