During relaxation, Ca²⁺ is actively pumped back into the sarcoplasmic reticulum (SR) via Ca²⁺-ATPase (SERCA), lowering cytosolic Ca²⁺ and allowing tropomyosin to block myosin-binding sites.

A private limited company offers limited liability, protecting Jamie's personal assets. As a separate legal entity, it allows him to be the sole owner (shareholder) and receive a salary as a director. A sole trader or partnership would have unlimited liability, risking personal assets.

$(0.0001)^2 = (10^{-4})^2 = 10^{-8}$

$0.01 = 10^{-2}$

$\dfrac{0.01}{(0.0001)^2} = \dfrac{10^{-2}}{10^{-8}} = 10^{-2-(-8)} = 10^6$

So $0.01$ is $10^6$ times as great as $(0.0001)^2$.

Option C ($15.38 per labour hour) is correct.

OAR uses budgeted figures: $40,000 ÷ 2,600 budgeted labour hours = $15.38 per labour hour.

Labour hours are the more appropriate basis as actual labour hours (2,900) exceed actual machine hours (2,700), indicating a labour-intensive department.

Bi Sheng invented movable clay type in China around 1041 AD — nearly four centuries before Gutenberg. However, the Chinese writing system contains thousands of characters (Mandarin has over 50,000, with several thousand in common use), compared to the 26-letter Latin alphabet used in European languages. Setting up movable type for Chinese therefore required an enormous number of individual pieces, making it cumbersome and time-consuming — often slower than traditional block printing for short or medium runs. By contrast, a European printer needed only a small set of metal type for the entire alphabet, making Gutenberg's press extraordinarily efficient for European languages. This alphabetic advantage is a key reason the printing press became a revolutionary mass communication tool in Europe but remained a marginal improvement in China. Interestingly, Gutenberg also used durable oil-based ink and rag paper introduced to Europe via Muslim trade routes, further improving output quality.