Please do both $1$ and $2.$ Thank you.

$(1)$ Air at $40F(5C)db$ and $60\%$ relative humidity is mixed with warm air at $100F(38C)db$

and $77F(25C)wb$ in the ratio of $2000$ cfm cool air to $1000$ cfm warm air. Find the resulting

humidity ratio and enthalpy using psychrometric Chart on the basis of volume flow rates. $(10)$

$(2)$ Rework Problem $3-25,$ using the same Chart, with the mixture condition computed on the

basis of the mass flow rates rather than volume flow rates. What is the percent error in the

mixture enthalpy and humidity ratios? $(10)$