Question

selling price of shoes is rupees 420 including 5% GST.The original price of the shoes is-
I) rupees 442
ii) rupees400
III) rupees 401.50
Iv) rupees420

please tell the process​

Answer 1

Let original price be x

$\\ \sf\longmapsto x+5\%\:of\:x=420$

$\\ \sf\longmapsto x+0.05x=420$

$\\ \sf\longmapsto 1.05x={420}$

$\\ \sf\longmapsto x=\dfrac{420}{1.05}$

$\\ \sf\longmapsto x=400$