Please answer this Assignment using the picture provided step by step

My ST# Factor is f$$c$=42$MPa $-$ Bar : $12-15$M

$1)$ A typical cross$-$section of a properly reinforced con$-$crete beam is shown in the figure below. The

material properties are summarized below. Use an effective depth of $650$ mm

a$)$ Is the beam properly reinforced$/$over$-$reinforced$/$ balanced Determine the factored

moment resistance? $(15$ marks$)$

b$)$ Consider the beam section $$a$)$above$.$ However, due to embedded items, the

reinforcing is raised by $65$ mm$,$ such that the effective depth is reduced to $585$ mm

$($Draw the new cross$-$section view$).$ Find the factored moment resistance considering

the new reinforcement layout. $(15$ marks$)$

c$)$ Comment on the effect of the change in reinforcement location on the moment

resistance $(5$ marks$)$

d$)$ Refer to the beam original effective depth. The same contractor reported that, due

to some problems related to batching, the actual $28-$day concrete strength is

reduced by $10\%.$ What is the new F$$c $?$ Find the factored moment resistance for the

new strength. $(15$ marks$)$

e$)$ What do you believe has a more substantial influence on the magnitude of the

factored moment resistance: a $10\%$ decrease in the concrete strength $($as solved in

part $$d$))$ or placement of reinforcement resulting in a $10\%$ decrease in the effective

depth $($as solved in part $$b$)).$ Why? $(10$ marks$)$