What is the difference in the monthly repayments between two alternative fully$-$ amortizing loans on a house valued at $$450,000?$ Option A is a $90\%$ LTV loan over $30$ years at $5\mathrm{.}85\%.$ Option B is a $98\%$ LTV loan over $20$ years at $5\mathrm{.}85\%.$ Calculate the difference as Option A minus Option B$.$

a$)-$$$925\mathrm{.}88$ b$)-$$$732\mathrm{.}16$ c$)+$$$215\mathrm{.}16$ d$)-$$$698\mathrm{.}78$

$20.$ What is the difference in the total repayments between the two loans described in Question $19?$

a$)-$$$202,868\mathrm{.}07$ b$)+$$$86,328\mathrm{.}39$ c$)-$$$7,640\mathrm{.}83$

d$)+$$$110,993\mathrm{.}64$