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In 1950, if the printing cost per newspaper was $0.05, what would have been the total cost of printing the average daily circulation?
[Note: From the graph, average daily circulation in 1950 was 520,000 newspapers]
Total cost = (number of newspapers) × (cost per newspaper)
Total cost $= 520{,}000 \times 0.05$
$= 520{,}000 \times \frac{5}{100} = 520{,}000 \times \frac{1}{20} = \frac{520{,}000}{20} = 26{,}000$
Therefore, the total cost would be $26,000.
Depolarization of the postsynaptic membrane is caused by diffusion of which ion?
Depolarization occurs when Na⁺ enters the postsynaptic neuron (excitatory postsynaptic potential). Cl⁻ influx causes hyperpolarization (inhibitory). Ca²⁺ triggers neurotransmitter release, not directly depolarization.
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