Jamal is waiting to be a millionaire. He wants to know how long he must wait if

a$.$ he invests $$$$22$ comma $163\mathrm{.}11$ at $18\%$today$?$

b$.$he invests $$$$51$ comma $092\mathrm{.}66$ at $13\%$today$?$

c$.$ he invests $$$$154$ comma $417\mathrm{.}53$ at $8\%$today$?$

d$.$ he invests $$$$263$ comma $395\mathrm{.}77$ at $6\%$today$?$

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Part $1$

a$.$How long will Jamal have to wait to become a millionaire if he invests $$$$22$ comma $163\mathrm{.}11$ at $18\%$today$?$ Answer please